2025 Ram 3500 6.7L I6 Cummins Turbo Diesel towing capacity.

The 2025 6.7L I6 Cummins Turbo Diesel tows 23,550 - 36,610 lbs across 4x4 configurations, depending on cab, drivetrain, axle ratio, wheel class, GVWR, GCWR, and box configuration.

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Built from the official Ram 2025 towing guide pages used for this engine page. Citations for 6.7L I6 Cummins Turbo Diesel are available below.

Towing data

2025 6.7L I6 Cummins Turbo Diesel towing capacity by configuration

Each row below is one published configuration from the 2025 Ram 3500 towing guide, showing towing capacity, payload, GVWR, GCWR, axle ratio, and wheel class.

RAM 3500 - 4X4 - CREW CAB - ST - 6'4'' BOX
3.42	SRW	11,800 lbs	3,970 lbs	31,820 lbs	23,550 lbs	Auto Trans · ST · BOX (unspecified)
RAM 3500 - 4X4 - CREW CAB - ST - 8' BOX
3.42	DRW	14,000 lbs	5,530 lbs	42,800 lbs	33,890 lbs	Auto Trans · ST · BOX (unspecified)
3.42	SRW	12,300 lbs	4,310 lbs	33,610 lbs	25,180 lbs	Auto Trans · ST · BOX (unspecified)
RAM 3500 - 4X4 - REG CAB - ST - 8' BOX
3.42	DRW	14,000 lbs	6,050 lbs	45,000 lbs	36,610 lbs	Auto Trans · ST · BOX (unspecified)
3.42	SRW	11,830 lbs	4,350 lbs	34,000 lbs	26,080 lbs	Auto Trans · ST · BOX (unspecified)

TONGUE LOAD CONV / 5TH-WHEEL

10% / 15%

Conventional vs. 5th-wheel/gooseneck

TRAILERING HARDWARE EQUIPMENT WEIGHT

75 / 70 / 250 LBS

Conventional / gooseneck / 5th wheel

HITCH THRESHOLDS TRAILER LIMITS

23k / 30k LBS

5th-wheel / gooseneck required above this weight

RATING METHOD STANDARD

SAE J2807

Industry tow-rating standard

VIEW ALL FINE PRINT

FIG. 2025 LOAD Baseline Weights

Weights Ram already counted in every rating

Passenger weight: 300 lbs counted for driver + passengers.
Options weight: 100 lbs counted for factory-installed options.
Conventional tongue: 10% of gross trailer weight.
5th-wheel / gooseneck tongue: 15% of gross trailer weight.

FIG. 2025 CALC Payload Formula

How Ram derives payload from base weight

Formula: Payload = GVWR - Base Weight
Values: Published as estimated values.
Rounding: nearest 10 lbs.

FIG. 2025 HITCH Hitch Loading

Hardware weight deducted from payload

Conventional hitch: 75 lbs of equipment weight.
Gooseneck: 70 lbs of equipment weight.
5th wheel: 250 lbs of equipment weight.

FIG. 2025 LIMIT Commercial / Hitch Limits

Chassis-cab and heavy-trailer thresholds

Body-completion weight: 80 lbs per foot from end of cab to end of frame.
5th-wheel required over: 23,000 lbs trailer weight.
Gooseneck required over: 30,000 lbs trailer weight.

FIG. 2025 STD Rating Standard

SAE J2807 compliance

Trailer Weight Rating and Tow Vehicle Trailering Weight are calculated as specified in SAE J2807.

FIG. 2025 WARN Warnings

Manufacturer safety warnings

Payload and Trailer Weight Rating are mutually exclusive.
GAWRs, GVWRs and GCWRs should never be exceeded.
Payload and GAWR should never be exceeded and must account for all of the above weights, including the appropriate trailering equipment and tongue weight.

FIG. 2025 NOTES Policy Notes

All published notes from the 2025 towing guide

Max. Trailer Weight Rating represents a properly equipped base trim configuration. p.4
Vehicles with a GVWR of 14,000 and greater are DRW. Vehicles less than 14,000 GVWR are SRW. p.4
Payload and Max Trailer Weights are ESTIMATED values. p.4
All values are shown in pounds unless otherwise stated. p.4
Payload and Max Trailer Weight values are rounded to the nearest 10lb. p.4
Payload = GVWR - Base Weight p.4
Payload and Trailer Weight Rating are mutually exclusive. p.4
GAWRs, GVWRs and GCWRs should never be exceeded. p.4
Trailer Weight Rating and Tow Vehicle Trailering Weight are calculated as specified in SAE J2807. p.4
Passenger Weight = 300 lb p.4
Options Weight = 100 lb p.4
Trailering Equipment Weight: 75 lb for Conventional Hitch, 70 lb for Gooseneck and 250 lb for 5th Wheel. p.4
Tongue weight: 10 percent of the gross trailer weight for Conventional Hitch, 15 percent of the gross trailer weight for a 5th Wheel or Gooseneck hitch. p.4
Payload and GAWR should never be exceeded and must account for all of the above weights, including the appropriate trailering equipment and tongue weight. p.4
Box Off Body Completion Weight = 80 lb per foot from end of cab to end of frame p.4
A fifth-wheel hitch is required for trailers over 23,000 lbs. p.4
A Gooseneck hitch is required for trailers over 30,000 lbs. p.4