Key takeaways
- The lowest rating sets your limit.
- GCWR covers the combined, loaded weight of both vehicles.
- Weigh your actual loaded rig.
Ratings to know
- Towing capacity: how much the motorhome manufacturer says it can tow.
- GCWR (Gross Combined Weight Rating): the maximum weight of the fully loaded motorhome plus the fully loaded towed vehicle together.
- GVWR (Gross Vehicle Weight Rating): the maximum loaded weight of a single vehicle.
- Hitch receiver rating: how much the hitch can pull and, for some, how much tongue weight it can carry.
- Tow bar capacity: the maximum towed weight the bar is rated for.
- Base plate rating: the weight the base plate is rated for.
The weakest link rule
Your limit is the lowest rating among all the parts above. A strong tow bar does not help if the hitch receiver or motorhome rating is lower.
Why GCWR matters
GCWR is generally set with the assumption that a towed vehicle has supplemental braking. Exceeding it affects braking, handling, and chassis stress. Weigh your loaded motorhome and towed vehicle at a scale to know your real numbers, since actual weight is often more than estimated. Learn about the brakes on our braking systems page.
How to check your numbers
- Find the motorhome's GCWR and towing capacity on its labels and in its manual.
- Weigh the loaded motorhome at a certified scale.
- Weigh the loaded towed vehicle, or use its curb weight plus everything you carry in it.
- Add the two weights and confirm the total is below GCWR.
- Compare the towed weight with the hitch, tow bar, and base plate ratings.
Leave a margin
Do not run right up to every limit. Extra margin helps braking, hills, wind, and braking system performance. If the numbers are close, consider a lighter towed vehicle.
Frequently asked questions
Where do I find my motorhome's GCWR?
On the chassis or federal certification label and in the owner's manual.
Does the weight of cargo in the towed vehicle count?
Yes. Use the loaded weight.
Where can I weigh my rig?
Truck stops and RV weigh programs often provide certified scales.
This page is general information. Always follow your vehicle owner's manual, equipment instructions, and the laws of the states and provinces you travel through.