Towing a Large RV with a Heavy-Duty Truck
A heavy-duty truck with a 22,000 lb tow rating pulling a 20,000 lb fifth-wheel RV operates at 91% capacity — close to the limit.
How to use this tool
- Enter the fully loaded trailer weight in pounds.
- Enter your vehicle's tow capacity from the owner's manual.
- Enter the tongue weight and your vehicle's tongue weight limit.
- Stay under 80% capacity for safe towing; 100%+ is over the limit.
Full-size fifth-wheel RVs push even heavy-duty trucks close to their limits — calculate exactly how much of your tow capacity you are using.
Frequently asked questions
- What percentage of tow capacity is safe?
- Stay under 80% of your vehicle's maximum tow rating for a comfortable safety margin. At 90–100% the vehicle is stressed and braking distance increases significantly.
- What is tongue weight?
- Tongue weight is the downward force the trailer coupler exerts on the hitch ball. It should be 10–15% of gross trailer weight. Too little causes trailer sway; too much stresses the vehicle's rear suspension.