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For 2026 U.S. heavy-duty pickups, Ford publishes the highest headline tow rating in this comparison, but that does not make its diesel the best choice for every trailer. The useful shortlist is Ford’s 6.7L Power Stroke, Ram’s 6.7L High-Output Cummins and Chevrolet’s 6.6L Duramax. Choose by checking your exact truck’s ratings against the loaded trailer, hitch method and payload—not by torque or a maximum tow figure alone.
How the 2026 diesel engines compare
The figures below are manufacturer specifications for the 2026 U.S. model year, not results from a controlled head-to-head tow test. Each maximum depends on configuration and equipment, and the manufacturers do not frame every figure the same way.
| Engine and truck | Published engine output | Published maximum towing | Published payload |
|---|---|---|---|
| Ford 6.7L Power Stroke, standard output | 475 hp and 1,050 lb-ft, according to Ford’s 2026 Super Duty Pickup Towing Information. | Up to 38,600 lb; Ford says maximums vary by configuration and equipment. | Up to 6,952 lb; maximum varies by configuration and equipment. |
| Ford 6.7L Power Stroke, High Output | 500 hp and 1,200 lb-ft, according to Ford’s 2026 Super Duty Pickup Towing Information. | Up to 40,000 lb of gooseneck towing, requiring Ford’s 40K Gooseneck Tow Package and the specified configuration. | Up to 6,935 lb; maximum varies by configuration and equipment. |
| Ram 6.7L High-Output Cummins, Ram 3500 Laramie Crew Cab configuration | 1,075 lb-ft of available base diesel torque, according to Ram’s 2026 Heavy Duty page; horsepower is not stated there. | Up to 33,890 lb for the stated Ram 3500 Laramie Crew Cab configuration. Check Ram’s towing guide for the exact build. | Up to 5,530 lb for the stated Ram 3500 Laramie Crew Cab configuration. |
| Chevrolet 6.6L Duramax | 470 hp and 975 lb-ft, according to Chevrolet’s 2026 Silverado HD page. | Up to 36,000 lb maximum available trailering for a Silverado 3500 HD; Chevrolet lists up to 22,420 lb for a Silverado 2500 HD. | Not stated in the cited 2026 Silverado HD figures; check the exact truck’s labels and Chevrolet’s configuration ratings. |
Ford’s published 40,000-lb figure is specifically a gooseneck maximum. Ram’s cited 33,890-lb figure is tied to a named 3500 Crew Cab configuration, while Chevrolet publishes different maximums for its 2500 HD and 3500 HD. These are useful shortlist figures, not interchangeable promises for a particular truck. The exact cab, bed, axle ratio, drivetrain, wheels, package and hitch method can change the applicable rating.
Why the highest tow rating may not fit your trailer
Payload includes people, cargo and hitch load
Payload is the truck’s capacity for weight carried by the truck, not a second name for tow capacity. The trailer’s tongue load or fifth-wheel/gooseneck pin load bears on the truck and uses payload along with occupants, cargo and hitch hardware. A truck can have a headline tow rating above the trailer’s weight and still lack payload for the trailer’s actual pin or tongue load plus the people and gear aboard.
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For fifth-wheel towing, the fifth-wheel hitch must be rated and fitted for the specific truck and trailer. Its weight also counts against payload. Do not select a hitch by capacity alone without confirming fitment and the ratings for the complete setup.
Every rating is a limit, not a menu of alternatives
Check the exact truck’s door-label ratings and the manufacturer’s chart for its configuration. The relevant limits include GVWR, the front and rear gross axle weight ratings (GAWR), and GCWR—the maximum combined weight of the truck and trailer. The truck, each axle and the combination must all remain within their applicable ratings; a high tow rating does not override an axle or GVWR limit.
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Ford’s 2026 guide cautions that maximum towing varies with cargo, vehicle configuration, accessories and passenger count. It also says payload must accommodate the trailer’s tongue or fifth-wheel kingpin load, passengers and cargo without exceeding GVWR or rear GAWR.
A practical way to choose an engine and truck
- Establish the loaded trailer weight. Use the weight for the trailer as it will actually travel, including cargo, and identify whether it will be pulled conventionally, by fifth wheel or by gooseneck. Compare it only with the rating for that hitch method and truck configuration.
- Find the truck’s payload and axle ratings. Read the labels on the specific truck rather than relying on a brochure maximum for another trim. Account for occupants, carried cargo and hitch hardware, as well as the trailer’s tongue or pin load.
- Match the complete truck to the manufacturer’s chart. Confirm cab, bed, axle ratio, drivetrain, wheel configuration and required towing package. For Ford’s cited 40,000-lb gooseneck maximum, that includes the 40K Gooseneck Tow Package. For a Ram, validate the build in Ram’s towing guide; do not assume the Laramie Crew Cab figure applies to another 3500.
- Check all the limits together. Verify the intended load against the truck’s GVWR and axle ratings and the truck-and-trailer combination’s GCWR, in addition to the applicable tow rating. Stay within every rating rather than treating the largest one as permission to exceed another.
- Use engine output as a tiebreaker for the work. Torque and horsepower help describe an engine, but they do not establish the payload or ratings of a particular truck. Consider the intended route, grades and workload only after the truck and loaded trailer meet the applicable limits.
Which diesel makes the most sense?
Consider Ford when the required configuration suits a gooseneck job
Among the cited 2026 figures, Ford has the highest headline maximum: up to 40,000 lb with the High Output 6.7L Power Stroke, but only as gooseneck towing with the specified 40K package and configuration. Its standard-output engine also has a separate published maximum. Neither maximum tells you whether a specific Super Duty has enough payload or axle capacity for your trailer.
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Consider Ram by the exact 3500 build, not torque alone
Ram’s High-Output 6.7L Cummins is listed at 1,075 lb-ft of available base diesel torque. The cited 33,890-lb maximum tow and 5,530-lb maximum payload belong to a Ram 3500 Laramie Crew Cab configuration. Confirm your intended truck and hitch method in Ram’s towing guide before applying those figures.
Compare Chevrolet’s 2500 HD and 3500 HD ratings separately
Chevrolet lists up to 36,000 lb maximum available trailering for the 6.6L Duramax-powered Silverado HD, with the 3500 HD listed at up to 36,000 lb and the 2500 HD at up to 22,420 lb. Those maximums are not ratings shared by every trim or configuration. Check the exact truck’s rating and payload before choosing between the classes.
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What the published figures can—and cannot—tell you
Manufacturer ratings support a careful specification comparison, not a reliability ranking or a prediction of real-world fuel economy, engine life or ownership cost. The cited pages do not establish a comparable real-world test across these engines. Ratings can also change with model year and build, so use the latest towing guide and the labels and build information for the truck you are considering.
The decision is therefore specific: choose the truck configuration whose hitch-method rating, payload, axle ratings, GVWR and GCWR all cover the loaded trailer and the people and equipment that will travel in the truck. A headline maximum is a starting point for that check, not the answer by itself.
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