RAM 3500 Heavy Duty Towing Capacity & Tow Calculator

The absolute maximum towing capacity of the RAM 3500 Heavy Duty reaches 37,090 pounds when configured as a Dual Rear Wheel (DRW / Dually) Regular Cab 4x2 equipped with the 6.7L High-Output Cummins Turbo Diesel inline-6 engine, the heavy-duty Aisin 6-speed automatic transmission, a 4.10 rear axle ratio, and the factory gooseneck towing prep package. Single Rear Wheel (SRW) models achieve a maximum gooseneck tow rating of 24,820 pounds, while conventional bumper-pull ratings are certified up to 20,000 pounds.

The difference centers on axle stability, vertical pin-weight payload limits, and maximum towing ceilings. Single Rear Wheel (SRW) models feature a maximum GVWR of 12,300 pounds and payload ratings between 3,740 and 4,920 pounds, making them ideal for heavy bumper-pull travel trailers and mid-size fifth wheels. Dual Rear Wheel (DRW) models add two additional rear wheels to prevent lateral sidewall squirm, raising the GVWR ceiling to the commercial Class 3 maximum of 14,000 pounds. This unlocks up to 7,680 pounds of payload and 37,090 pounds of gooseneck towing capacity, essential for luxury fifth wheels with pin weights exceeding 3,500 pounds.

The 6.7L High-Output Cummins Turbo Diesel inline-6 produces 420 horsepower and a monumental 1,075 lb-ft of torque at 1,800 RPM, allowing properly equipped dually models to pull up to 37,090 pounds. The standard 6.4L Heavy-Duty HEMI V8 gas engine produces 410 horsepower and 429 lb-ft of torque at 4,000 RPM, topping out at 18,210 pounds of towing capacity. While the diesel offers unmatched pulling torque and grade braking power, the lighter gas V8 delivers the highest payload ratings on the platform (up to 7,680 lbs) because the cast-iron engine block is roughly 400 pounds lighter.

A RAM 3500 Mega Cab provides unmatched interior passenger space and reclining rear seating, but the larger cabin footprint adds roughly 400 pounds of curb weight. In DRW dually configuration with the 6.7L High-Output Cummins Diesel, the Mega Cab tows up to 33,020 pounds with 5,460 pounds of payload capacity. In SRW configuration, the Mega Cab tows up to 24,200 pounds with 4,150 pounds of payload capacity.

The maximum certified conventional bumper-pull towing capacity for the RAM 3500 is 20,000 pounds when equipped with a factory Class V 2.5-inch or 3-inch receiver hitch. RAM factory guidelines mandate that any trailer weighing over 20,000 to 23,000 pounds must utilize a bed-mounted fifth-wheel or gooseneck hitch to ensure proper weight distribution across the rear axle and maintain braking stability.

The optional RAM factory Auto-Level rear air suspension replaces traditional rear leaf springs with heavy-duty air bellows and dual onboard compressors. It detects payload or trailer tongue weight automatically and levels the truck to maintain proper headlight alignment, front axle steering contact, and full suspension travel. It also includes an in-cab Bed Lowering Mode that drops the rear suspension two inches for effortless fifth-wheel and gooseneck hitch pin alignment.

Yes, but configuration is critical. Large luxury fifth-wheel RVs (38 to 44 feet) routinely carry gross vehicle weights of 16,000 to 22,000 pounds with kingpin weights between 3,200 and 4,800 pounds. While a Single Rear Wheel (SRW) RAM 3500 can technically pull the trailer weight, its 4,000 to 4,400-pound payload is quickly overloaded once passengers, cargo, and hitch hardware are added. For large fifth wheels, the Dual Rear Wheel (DRW) dually model is strongly recommended for its 5,400 to 6,760-pound certified payload capacity.

The Standard-Output 6.7L Cummins produces 370 horsepower and 850 lb-ft of torque at 1,700 RPM, paired with the Chrysler-designed 68RFE 6-speed automatic transmission. The High-Output (HO) 6.7L Cummins features a compacted graphite iron (CGI) block, revised turbocharger, and forged connecting rods to produce 420 horsepower and 1,075 lb-ft of torque at 1,800 RPM. The HO diesel is exclusively paired with the Japanese commercial-grade Aisin AS69RC 6-speed heavy-duty automatic transmission, which is specifically reinforced for extreme 35,000+ lb trailering.