Heavy Cargo Logistics Providers for China–USA Imports

Heavy cargo is where a conventional freight-forwarding strategy can quickly become inadequate.

A standard China–USA import may be planned around:

Supplier → Port → Ocean → U.S. Customs → Drayage → Warehouse

Heavy cargo often requires an entirely different sequence:

Factory Survey → Cargo Engineering → Specialized Equipment → Export Handling → Ocean / Breakbulk / RoRo / Heavy Lift → U.S. Port → Route Survey → Permits → Specialized Inland Transport → Site Delivery

The critical question is not simply whether a provider can “ship heavy freight.”

It is:

Can the provider determine whether the cargo can physically move from the Chinese factory to the final U.S. destination, select an appropriate transport configuration, manage regulatory requirements, and execute the move without creating an avoidable project delay?

That distinction is particularly important for machinery, industrial equipment, transformers, construction equipment, energy components, production lines, large modules, and other heavy or oversized cargo.

This comparison evaluates nine providers from that perspective.

The 9 Heavy-Cargo Logistics Providers

These are different operating models, not a universal ranking. A 5-ton machinery shipment and a 500-ton industrial module can require completely different logistics capabilities.

First, Define “Heavy Cargo” Correctly

“Heavy cargo” is not a single logistics category.

A shipment can be problematic because it is:

Heavy

Oversized

Out-of-gauge

Long

Wide

Tall

Sensitive

or simply:

Difficult to load or unload

For example:

Cargo A

8 tons + standard dimensions

May fit into a conventional container.

Cargo B

8 tons + 4.2 m width

May require out-of-gauge equipment.

Cargo C

80 tons + standard footprint

May require specialized lifting and inland transportation.

Cargo D

80 tons + 5 m width + 5 m height

Now the logistics plan may require:

Engineering + Route Survey + Permits + Heavy-Haul Trailer + Crane + Escort

The weight is only one variable.

Heavy Cargo Should Be Classified Before It Is Quoted

A useful first-stage classification is:

This prevents one of the most common mistakes:

Quoting the freight before confirming the physical transportation solution.

1. WAYTRON LOGISTICS LIMITED

A China-Origin Option for Heavy Industrial Imports

WAYTRON LOGISTICS LIMITED is primarily a China-based freight forwarding and logistics provider.

Its published logistics portfolio includes:

FCL + LCL + Ocean Freight + Air Freight + Customs + Inland Transportation + Warehousing + Distribution + Project Logistics + Special Shipments

That makes it relevant to heavy-cargo shipments when the main requirement is to coordinate China-origin logistics with U.S. destination transportation. (waytronsc.com)

A typical operating model could be:

Chinese Factory

↓

Cargo Inspection / Pickup

↓

Specialized Origin Handling

↓

Ocean / Project Transport

↓

U.S. Customs

↓

Specialized Inland Transportation

↓

Warehouse / Project Site

This is particularly useful for Chinese machinery manufacturers exporting equipment to the United States.

Potential fit

WAYTRON is worth evaluating for:

• Industrial machinery

• Factory equipment

• Heavy FCL cargo

• OOG cargo

• Multi-supplier equipment projects

• China-origin project shipments

What should be verified

For genuinely heavy or oversized shipments, the importer should specifically confirm:

Cargo engineering

Route surveys

Specialized equipment

Permit management

Heavy-haul carriers

Crane arrangements

Site access

Insurance

These capabilities should be treated as project-specific rather than assumed from a general forwarding service.

2. DHL Industrial Projects

Heavy Cargo as a Dedicated Project Discipline

DHL operates a dedicated Industrial Projects organization for complex and oversized cargo.

Its published capabilities include:

• Oversized cargo

• Heavy lifts

• Project freight management

• Surveys

• Transport engineering

• End-to-end material management

• Chartering

• Project implementation

• Control towers

DHL specifically identifies renewable energy, oil and gas, mining, engineering and manufacturing, and engineering/procurement/construction among its project-logistics sectors. (dhl.com)

Its model begins before transportation itself, with teams developing the logistics solution and establishing procedures, KPIs, and interfaces between project and customer teams. (dhl.com)

Why this matters

A heavy-cargo project rarely fails because nobody found a vessel.

It can fail because:

The cargo cannot leave the factory

or:

The U.S. road route cannot accommodate the load

or:

The site crane isn't available

DHL's model is designed around those broader constraints.

Potential fit

• Energy

• Industrial manufacturing

• Mining

• Infrastructure

• Large machinery

• EPC projects

3. DSV Project Transport

Particularly Strong for Engineered Heavy Cargo

DSV's Project Transport business is explicitly designed for:

Heavy + Oversized + Complex Cargo

Its published U.S. offering includes tailor-made solutions for energy, industrial, and capital-infrastructure projects, while DSV describes planning, transport engineering, route and site surveys, origin and destination services, and specialized project management. (dsv.com)

DSV also states that complex projects can spend about 90% of their time in planning, illustrating how much engineering and coordination can occur before physical transportation starts. (dsv.com)

Its origin services can include:

Vendor and Purchase Order Expediting

Collection

Marshalling

Industrial Packing

Port / Airport Delivery

Export Customs

and destination services can include import customs and local project support. (dsv.com)

Potential fit

• Heavy machinery

• Energy equipment

• Industrial projects

• Renewable energy

• Infrastructure

• Complex China-origin equipment programs

4. Kuehne+Nagel

Engineering Before Transportation

Kuehne+Nagel is particularly relevant where heavy cargo requires an engineered route rather than a standard booking.

Its U.S. project logistics operation includes:

Risk Management + Engineering + Chartering + Heavy / Oversized Transport

and its engineering service covers route surveys, swept-path analysis, equipment design, lifting calculations, and marine engineering. (kuehne-nagel.com)

The company also uses 3D simulations and consulting to identify potential transportation issues before execution. (kuehne-nagel.com)

For a highly oversized piece, this can be decisive.

Suppose a machine is:

6.0 m wide

The relevant question is not:

“What is the truck rate?”

It is:

“Can the complete route accommodate a 6.0 m-wide load?”

That may require:

Swept Path Analysis + Bridge Review + Turning Radius + Overhead Clearance + Utility Coordination

Potential fit

• Heavy industrial machinery

• Power equipment

• Renewable projects

• Infrastructure

• Construction equipment

• Complex international project cargo

Kuehne+Nagel also offers customized chartering solutions for project cargo. (kuehne-nagel.com)

5. CEVA Logistics / Fagioli

The Most Specialized Heavy-Lift Model in This Comparison

CEVA's 2026 project-logistics proposition changed materially following its acquisition of Fagioli.

CEVA completed the acquisition of Fagioli on March 31, 2026, adding Fagioli's heavy-lift assets and engineering expertise to CEVA's existing project-logistics operation. CEVA describes the combined capability as covering the project lifecycle from design through transportation, complex delivery, and installation. (cevalogistics.com)

The resulting CEVA Logistics | Fagioli offering includes:

Project Cargo Management

In-House Engineering

Heavy Lift

Oversized Transport

Multimodal Transport

Installation Services

(cevalogistics.com)

Its site-operations division provides specialized equipment including:

• SPMT axle lines

• Strand jacking systems

• Tower and gantry systems

• Crawler cranes

• Skidding and jacking systems

CEVA says its crawler crane capabilities include units up to approximately 3,000 tons, while its SPMT equipment can support extremely heavy and oversized cargo movements. (cevalogistics.com)

Why this matters

This is a major distinction.

A normal freight forwarder can coordinate:

Transport

A heavy-lift specialist can potentially coordinate:

Transport + Engineering + Lifting + Positioning + Installation

Potential fit

• Extremely heavy machinery

• Industrial modules

• Power equipment

• Infrastructure

• Heavy-lift construction

• Complex installation projects

6. Expeditors

Custom Project-Cargo Planning

Expeditors operates a dedicated Project Cargo service for oversized and heavy-lift freight.

Its published capabilities include:

Over-Dimensional Cargo

Heavy Lift

Breakbulk Chartering

Complex Multimodal Moves

Route Studies

Risk Assessments

alongside customized project management. (expeditors.com)

The advantage is flexibility.

The logistics plan can be built around:

Cargo

Route

Available Infrastructure

Required Delivery Date

rather than squeezing the cargo into a conventional freight product.

Potential fit

• Industrial machinery

• Production equipment

• Heavy components

• Multimodal cargo

• Complex project shipments

Expeditors becomes particularly interesting when the heavy shipment also requires customs, warehousing, delivery management, or broader international forwarding.

7. AIT Worldwide Logistics

Particularly Relevant to Machinery and Industrial Equipment

AIT provides dedicated project-cargo logistics covering oversized and heavy freight.

Its current service describes:

• Cranes

• Forklifts

• Rigging

• Specialized equipment

• Certified operators

• Permits

• Pre-lift surveys

• Route engineering

• Specialized packaging

• Customs clearance

• Tracking

• 24/7 support

(aitworldwide.com)

AIT defines project cargo broadly as freight that cannot easily move through standard container logistics because of dimensions, weight, or special handling requirements.

Its examples include:

Turbines

Locomotives

Construction equipment

Boats

Helicopter blades

and other specialized cargo. (aitworldwide.com)

AIT also has a Shanghai location whose services include project cargo, oversized freight, breakbulk, sea freight, rail, intermodal, customs, warehousing, and specialized transportation. (aitworldwide.com)

Potential fit

• Machinery

• Manufacturing equipment

• Industrial projects

• Heavy components

• China-origin equipment shipments

8. Dimerco

Asia-Origin Heavy Cargo Coordination

Dimerco is especially relevant when a heavy-cargo shipment begins somewhere in Asia and requires a coordinated origin network.

Its dedicated project-logistics service covers oversized and out-of-gauge cargo, specialized packing and handling, required permits, multimodal transportation, rigging, cargo securing, crating, customs clearance, and project management. Dimerco also describes door-to-door multimodal transportation for oversized cargo. (dimerco.com)

Its network is particularly concentrated across:

China + India + ASEAN + North America

which can be valuable for a project sourcing equipment from several Asian locations.

Dimerco also emphasizes dedicated project managers and 24/7 project visibility. (dimerco.com)

Potential fit

• Electronics equipment

• Technology infrastructure

• Oil and gas equipment

• Construction

• Asia-wide sourcing

• Multi-origin project cargo

9. Sinotrans

A China-Origin Heavy Logistics Option

Sinotrans is worth considering separately because the China-origin side of project logistics can be substantial.

Its broader group includes:

Freight Forwarding + Transportation + Storage + Terminal Services + Heavy-Lift Logistics

and Sinotrans Heavy-lift Logistics is identified as a group company specializing in hoisting and transportation. (sinotrans.com)

Sinotrans also maintains a project-logistics industry solution combining air, ocean, and supply-chain-management capabilities for customized end-to-end projects. (sinotrans.com)

Why it can be relevant

For a project with:

Several Chinese equipment suppliers

the origin-side logistics can itself become complex.

The provider may have to coordinate:

Factory Pickup + Temporary Storage + Consolidation + Heavy Handling + Export + Vessel Loading

before the cargo even leaves China.

Potential fit

• China-origin industrial equipment

• Heavy machinery

• Construction equipment

• Engineering projects

• Multi-supplier Chinese projects

For a China–USA shipment requiring highly specialized U.S. inland engineering or installation, the U.S. execution scope should be evaluated separately.

The Most Important Decision: Heavy but Standard, or Truly Project Cargo?

Not every heavy shipment needs a global project-logistics specialist.

Consider:

Scenario A

Machinery

Weight:

8 tons

Dimensions:

Within standard container limits

This may simply require:

Heavy FCL + Appropriate Handling

A conventional freight forwarder may be sufficient.

Scenario B

Machine

Weight:

15 tons

Width:

3.2 m

Height:

3.8 m

Now specialized equipment and route review may be necessary.

Scenario C

Transformer

Weight:

100 tons

Width:

4.5 m

Height:

4.8 m

Now the operation may require:

Heavy Lift + Route Survey + Permits + Escort + Specialized Trailer + Crane

Scenario D

Industrial Module

Weight:

400 tons

Dimensions:

Extremely oversized

Now the project may involve:

Engineering + Breakbulk / Heavy-Lift Vessel + Port Engineering + SPMT + Heavy Lift + Site Positioning

These are not the same logistics service.

Cargo Dimensions Often Matter More Than Weight

A cargo item can be physically heavy but easy to transport if it has a compact footprint.

Another item can be relatively light but extremely difficult to move because of its dimensions.

For example:

12 tons

in a:

3 m × 2 m × 2 m

configuration can be much easier than:

7 tons

in a:

6 m × 4 m × 4 m

configuration.

The second cargo may create:

Road Clearance + Turning + Permit + Bridge + Escort

problems.

Therefore:

Heavy-cargo quotations should always begin with geometry, not just gross weight.

The Factory Gate Is the First Test

One of the easiest mistakes is to begin the project at the port.

The real start is:

Factory Gate

Ask:

Can the cargo leave the building?

Is there enough door clearance?

Is an internal crane available?

Can a trailer reach the loading position?

Is the loading surface strong enough?

Can the cargo be safely lifted?

Does the factory have a loading dock?

The provider may need to conduct:

Pre-shipment Survey

before the cargo is collected.

This is exactly why project-logistics engineering services can be materially different from standard freight forwarding.

U.S. Inland Transportation Can Become the Hardest Part

Suppose an industrial machine is unloaded in Los Angeles.

The destination is:

Phoenix

The move may be relatively straightforward.

Now change the destination to:

Rural Texas

or:

A remote power project

The route may involve:

Oversize permits

Escort vehicles

Bridge restrictions

Temporary road closures

Utility coordination

Site-access modifications

The ocean shipment itself might be the easy part.

Kuehne+Nagel specifically describes route surveys and swept-path analysis for complex heavy and oversized cargo, while DSV provides detailed route and site surveys as part of project transport. (kuehne-nagel.com) (dsv.com)

The Port Must Be Able to Handle the Cargo

Another common mistake:

“The vessel can carry it, so the shipment is ready.”

Not necessarily.

The U.S. port needs:

Discharge Equipment

Crane Capacity

Berth Compatibility

Heavy-Lift Handling

Storage Area

Specialized Terminal Services

A cargo that can theoretically arrive at a port may still require a different berth, special crane, or specialized handling plan.

This is especially important for:

Breakbulk

RoRo

Heavy Lift

Out-of-Gauge

cargo.

Container, Flat Rack, Breakbulk, or RoRo?

The transportation format should be selected based on the cargo.

The correct choice can change the entire cost structure.

A flat-rack solution can create different:

Port Handling + Lashing + Vessel Planning

requirements from standard FCL.

Breakbulk can create different:

Charter + Stevedoring + Heavy-Lift

requirements again.

Why Lashing and Securing Matter

Heavy cargo does not simply get placed on a vessel or trailer.

It must be properly secured.

Depending on the cargo, this can involve:

Lashing

Blocking

Bracing

Dunnage

Center-of-Gravity Analysis

Load Distribution

Seafastening

A transport-engineering specialist may need to produce a formal securing plan.

Kuehne+Nagel describes marine engineering as part of its project logistics capability, while Dimerco specifically includes cargo securing and rigging within its oversized-cargo services. (kuehne-nagel.com) (dimerco.com)

Heavy Cargo Also Creates Weight-Distribution Problems

A truck may legally be able to carry:

100 tons

but that does not mean any 100-ton object can be placed on it.

The provider needs to consider:

Axle Load

Center of Gravity

Trailer Configuration

Bridge Loading

Road Surface

Turning Radius

This is another reason why project logistics begins with engineering.

Installation Can Be the Final Logistics Challenge

For some industrial projects, delivery to the site is not enough.

The cargo may need to be:

Unloaded

Moved across the site

Lifted

Positioned

Skidded

Installed

CEVA's post-acquisition Fagioli capabilities explicitly extend through on-site logistics, final positioning, and installation. (cevalogistics.com)

This creates a much broader service:

Factory → Site → Foundation

rather than:

Factory → Port

Project Logistics Should Be Scheduled Around the Site

Heavy cargo often has an unusual timing requirement.

The objective may not be:

“Deliver as fast as possible.”

It may be:

“Deliver when the site, crane, crew, and installation window are ready.”

Suppose a crane costs:

$50,000/day

and the cargo arrives three days too early.

The resulting storage or crane coordination cost can outweigh transportation savings.

Conversely, arriving two days late may delay commissioning.

Therefore:

For heavy project cargo, schedule accuracy can be more valuable than pure transit speed.

Heavy Cargo Cost Should Be Risk-Adjusted

A simple freight model:

Ocean + Trucking

is inadequate.

A more useful project model is:

Total Heavy-Cargo Cost = Engineering + Origin Handling + International Transport + Port Handling + Customs + Specialized Inland + Permits + Escorts + Site Handling + Storage + Insurance + Contingency

Then evaluate:

Probability of Delay

Probability of Damage

Site Disruption

Equipment Idle Time

This produces a more realistic risk-adjusted logistics cost.

How to Compare Providers

Suppose three logistics companies quote the same heavy machine.

Provider B may have the lowest initial quotation.

But it is not actually comparable if:

Permits are excluded

Engineering is optional

Crane is excluded

Site handling is excluded

The goal is therefore:

Compare identical scopes before comparing prices.

Which Provider Model Fits Which Shipment?

These are starting points based on published capabilities.

How WAYTRON Fits the Heavy-Cargo Market

WAYTRON LOGISTICS LIMITED is most naturally evaluated as a China-origin freight-forwarding and logistics provider with project and special-shipment capabilities, rather than as a dedicated ultra-heavy-lift engineering company.

Its published services include:

Ocean Freight + FCL/LCL + Customs + Inland Transportation + Warehousing + Distribution + Project Logistics + Special Shipments. (waytronsc.com)

That makes it potentially relevant to China-based manufacturers exporting machinery or other heavy cargo into the United States.

A typical flow could be:

China Factory

↓

Pickup / Special Handling

↓

Export

↓

Ocean / Project Transport

↓

U.S. Customs

↓

Specialized Inland Transportation

↓

Warehouse / Site

For cargo involving extreme dimensions or very large lifting requirements, the key question is whether WAYTRON's project scope for the specific shipment includes the necessary engineering, equipment, permits, heavy-haul coordination, and site operations.

That should be confirmed before comparing it with providers such as CEVA Fagioli, DSV, DHL Industrial Projects, or Kuehne+Nagel.

A Heavy-Cargo RFQ Should Include Drawings

A standard ocean quotation can often start with:

Port + Container + Weight

A heavy-cargo RFQ should include much more:

Cargo Drawings

Exact Dimensions

Gross Weight

Center of Gravity

Lifting Points

Packaging

Loading Method

Cargo-Ready Date

Factory Address

Origin Port

U.S. Port

Final Destination

Site Access

Required Delivery Date

Unloading Method

Crane Requirements

This gives providers enough information to engineer the shipment rather than guess.

The 10 Questions That Matter Most

1. Can you perform a pre-shipment survey?

2. Can you engineer the transport configuration?

3. Can you conduct a route survey?

4. Who handles permits and escorts?

5. What specialized trailers or lifting equipment are available?

6. Can you arrange heavy-lift or breakbulk vessel capacity?

7. Who manages cargo securing and lashing?

8. Who coordinates the U.S. port discharge?

9. Can you deliver to the final project site?

10. Can you handle site positioning or installation?

The more “yes” answers are supported by a documented scope, the closer the provider is to a true project-logistics solution rather than a conventional freight-forwarding service.

Common Heavy-Cargo Import Mistakes

Quoting from weight only

Dimensions can be more important than gross weight.

Assuming a standard container will work

Some cargo needs flat racks, open tops, RoRo, or breakbulk.

Ignoring the factory gate

The cargo may not be physically retrievable with ordinary equipment.

Choosing the port by ocean rate

A cheaper port can create a much more expensive U.S. inland move.

Forgetting permits

Heavy-haul transportation may require extensive permitting and route planning.

Ignoring center of gravity

Incorrect load distribution can create safety and regulatory problems.

Scheduling delivery without checking site readiness

A heavy module should arrive when the receiving and lifting operation is prepared.

Treating installation as someone else's problem

For complex industrial projects, the final positioning may be part of the logistics requirement itself.

Frequently Asked Questions

What is heavy cargo logistics?

Heavy cargo logistics is the transportation and handling of freight whose weight, dimensions, sensitivity, or handling requirements make standard transportation unsuitable or insufficient.

What is the difference between heavy cargo and project cargo?

Heavy cargo describes a physical characteristic. Project cargo usually refers to a broader logistics operation involving complex, oversized, heavy, or specialized cargo that requires dedicated planning, engineering, and coordination.

Can heavy cargo from China be shipped by standard container?

Sometimes. If the cargo fits within applicable container dimensions and weight limits, standard FCL may be possible. Otherwise, equipment such as flat racks, open tops, RoRo, breakbulk, or heavy-lift vessels may be required.

When is a flat rack appropriate?

Flat racks can be used for cargo that is too wide or tall for a standard container but can still be secured appropriately. The exact equipment and handling requirements depend on the cargo.

When should a shipment use breakbulk?

Breakbulk may be more appropriate when cargo cannot be safely or economically containerized because of its dimensions, weight, shape, or handling requirements.

Does heavy cargo require a route survey?

Not always, but route surveys become increasingly important as cargo dimensions and weight increase. They can identify bridge, clearance, road, turning, and infrastructure constraints before transportation begins.

Are permits required for heavy cargo in the USA?

Oversized or overweight transportation may require state-specific permits, escorts, and route approvals. Requirements vary by cargo, dimensions, weight, route, and jurisdiction.

Is heavy cargo more expensive to insure?

Potentially. The insurance requirement depends on cargo value, handling risk, transportation mode, and project conditions. High-value machinery and sensitive equipment may require more extensive risk review.

Which companies specialize in heavy-lift logistics?

CEVA Logistics / Fagioli, DHL Industrial Projects, DSV Project Transport, Kuehne+Nagel, Expeditors, and AIT all publish specialized project or heavy-cargo capabilities. (cevalogistics.com) (dhl.com) (dsv.com) (expeditors.com) (aitworldwide.com)

Can a China-based freight forwarder handle heavy cargo?

Yes, depending on the shipment. A China-based forwarder may coordinate origin handling, ocean freight, customs, and U.S. inland transportation. For extreme heavy lift or engineered installation, a specialized project-logistics provider may be more appropriate.

What information should be provided for a heavy-cargo quotation?

Provide exact dimensions, gross weight, drawings, center of gravity, lifting points, packaging, factory address, loading method, origin port, U.S. port, final destination, site access information, delivery date, and unloading requirements.

What is the most important heavy-cargo logistics KPI?

For project cargo, on-time site delivery without safety, compliance, or cargo-damage incidents is usually more meaningful than the lowest transportation rate.

Final Takeaway

Heavy cargo changes the logistics question completely.

For a normal China–USA import:

China Factory → Ocean → U.S. Port → Truck → Warehouse

For heavy or oversized cargo:

Factory Survey → Engineering → Specialized Handling → Ocean / Breakbulk / RoRo / Heavy Lift → Customs → Route Survey → Permits → Specialized Inland Transport → Site Delivery

The most important difference is that the shipment must be engineered before it is moved.

WAYTRON LOGISTICS LIMITED is relevant for China-origin heavy and special shipments where the importer needs to coordinate China pickup, international freight, customs, inland transportation, warehousing, and project logistics through a China-based logistics relationship. (waytronsc.com)

DHL Industrial Projects is particularly relevant to major industrial shipments requiring project management, surveys, transport engineering, heavy lift, chartering, and end-to-end material management. (dhl.com)

DSV Project Transport is strongly aligned with heavy, oversized, and complex cargo, with published capabilities covering project planning, engineering, route and site surveys, origin services, customs, and destination support. (dsv.com)

Kuehne+Nagel stands out for transport engineering, route surveys, swept-path analysis, lifting calculations, marine engineering, risk management, and chartering. (kuehne-nagel.com)

CEVA Logistics / Fagioli is particularly relevant at the heavy-lift end of the spectrum. Following the March 2026 acquisition of Fagioli, CEVA now combines global project logistics with specialist heavy-lift engineering, equipment, site operations, and installation capabilities. (cevalogistics.com)

Expeditors is a useful option for customized heavy and oversized projects involving route studies, risk assessments, breakbulk chartering, and complex multimodal transportation. (expeditors.com)

AIT Worldwide Logistics is particularly relevant to machinery and industrial equipment requiring specialized transportation equipment, permits, pre-lift surveys, route engineering, customs, and site-related support. (aitworldwide.com)

Dimerco is particularly useful for Asia-origin heavy and OOG shipments because its project-logistics service combines oversized-cargo planning, specialized handling, permits, multimodal transportation, cargo securing, customs, and dedicated project management. (dimerco.com)

Sinotrans is relevant to China-origin projects because its wider organization includes forwarding, transportation, storage, terminals, and dedicated heavy-lift logistics. (sinotrans.com)

The most important mistake is to ask:

“Which company offers the cheapest heavy-cargo freight rate?”

The better question is:

“Which provider can safely and legally move this exact piece of cargo from the Chinese factory gate to the final U.S. site, including the engineering, permits, handling, and delivery requirements?”

That changes the purchasing criteria from:

Freight Rate

to:

Physical Feasibility + Engineering + Total Cost + Schedule Reliability + Risk Control

For relatively heavy but standard cargo, a conventional forwarder may be enough.

For moderate OOG cargo, specialized equipment and route planning become important.

For extremely heavy cargo, engineering, heavy lift, specialized transport, and site operations can become more important than the ocean transportation itself.

That is the key principle for China–USA heavy-cargo logistics:

The transportation solution should be designed around the cargo and the route—not the cargo forced into a transportation solution that happens to e available.