Skip to content
CampingCalc

Towing Weight Calculator: Does the trailer match my RV?

A motorhome towing a 3,000 lb trailer needs a hitch rated for it, a tongue weight of about 300–450 lb – and that tongue weight counts as payload on the tow vehicle. This calculator checks the ratings from your labels against each other: towing capacity, tongue weight (maximum and minimum), gross combination weight and GVWR.

Units
Tow vehicle (certification label and hitch)

Weighed or from the payload calculator. 0 = don't check.

The smaller of vehicle and hitch receiver applies.

On the chassis label or in the owner's manual; 0 = don't check.

Trailer

Weighed or dry weight + cargo.

Measure with a tongue weight scale; aim for 10–15% of the trailer weight.

Result

Combination check

1 check failed

Actual gross combination weight
9,921 lb
Applicable towing capacity
4,409 lb
Applicable tongue weight max.
220 lb
at least 265 lb
Tongue weight share
5%
guideline 10–15%
  • Minimum tongue weight (10% of the trailer weight, NHTSA): 132 lb, at least 265 lb required.
  • This calculator checks the values you entered against each other. The certification labels, hitch ratings, manufacturer information and state law are authoritative; trailer brake requirements, license rules and special cases are not covered.
Show calculation
  1. 1✓ Trailer below its GVWR: 2646 lb of 2866 lb
  2. 2✓ Towing capacity of the tow vehicle (braked): 2646 lb of 4409 lb
  3. 3✓ Tongue weight below the rating: 132 lb of 220 lb
  4. 4✗ Minimum tongue weight (10% of the trailer weight, NHTSA): 132 lb, at least 265 lb required
  5. 5✓ Tow vehicle incl. tongue weight below its GVWR: 7407 lb of 7716 lb (tongue weight counts as payload)
  6. 6Tongue weight share: 132 lb ÷ 2,646 lb = 5%

 

How it's calculated

The calculator compares the actual weights with the ratings from the certification labels of tow vehicle, hitch and trailer:

  1. Actual trailer weight ≤ trailer GVWR
  2. Actual trailer weight ≤ towing capacity of the tow vehicle (braked / unbraked)
  3. Tongue weight ≤ smallest rating of tow vehicle, hitch receiver and trailer
  4. Tongue weight ≥ 10% of the actual trailer weight (NHTSA recommendation: 10–15% for conventional hitches)
  5. Gross combination weight, if the manufacturer states a GCWR
  6. Tow vehicle + tongue weight ≤ GVWR of the tow vehicle – the tongue weight is payload

Driver's license

There is no federal license class for towing a recreational trailer in the US. A few states require a non-commercial Class A or B license for very heavy combinations (e.g. California above 26,000 lb GCWR) – check your state's DMV rules. The calculator therefore performs no license check for US vehicles.

The ratings on the certification labels (GVWR, GAWR, GCWR, hitch rating) are authoritative, not the actual weight. All information without guarantee – when in doubt consult the labels, manufacturer information and your state's DMV.

Worked example

Class C motorhome with 14,000 lb GVWR (loaded 13,000 lb, hitch rated 5,000 lb braked, 500 lb tongue weight, 18,000 lb GCWR) tows a braked trailer with 3,500 lb GVWR, loaded 3,000 lb, measured tongue weight 350 lb.

Inputs

  • Tow vehicle GVWR: 13,999 lb
  • Actual weight of the loaded tow vehicle (without tongue weight): 13,007 lb
  • Towing capacity, braked trailer (hitch/chassis rating): 5,000 lb
  • Towing capacity, unbraked trailer: 1,001 lb
  • Tongue weight rating of vehicle/hitch receiver: 500 lb
  • Gross combination weight rating (GCWR), if stated: 18,001 lb
  • Trailer has brakes (electric or surge): yes
  • Trailer GVWR: 3,501 lb
  • Actual weight of the loaded trailer: 2,998 lb
  • Tongue weight rating of the trailer coupler: 0 lb
  • Actual tongue weight (tongue weight scale): 353 lb

Result

All checks passed

Combination check

Actual gross combination weight
16,006 lb
Applicable towing capacity
5,000 lb
Applicable tongue weight max.
500 lb
Tongue weight share
11.8%

Calculation

  1. ✓ Trailer below its GVWR: 2998 lb of 3501 lb
  2. ✓ Towing capacity of the tow vehicle (braked): 2998 lb of 5000 lb
  3. ✓ Tongue weight below the rating: 353 lb of 500 lb
  4. ✓ Minimum tongue weight (10% of the trailer weight, NHTSA): 353 lb, at least 300 lb required
  5. ✓ Gross combination weight: 16006 lb of 18001 lb
  6. ✓ Tow vehicle incl. tongue weight below its GVWR: 13360 lb of 13999 lb (tongue weight counts as payload)
  7. Tongue weight share: 353 lb ÷ 2,998 lb = 11.8%

The variables explained

Towing capacity braked/unbraked
Maximum actual trailer weight the tow vehicle may tow per manufacturer and hitch rating.
Tongue weight rating (vehicle / hitch receiver / trailer coupler)
Vertical load on the hitch; the smallest rating applies.
Actual weights
Best weighed (CAT scale, tongue weight scale).
Gross combination weight rating (GCWR)
Upper limit for tow vehicle + trailer together, stated by most chassis manufacturers.

Common mistakes

  • Setting the tongue weight too low: the combination sways. Load to about 10–15% tongue weight, as close to the hitch rating as allowed.
  • Forgetting the tongue weight on the tow vehicle – it counts toward payload and rear axle load.
  • Reading the towing capacity from the brochure: the hitch receiver's rating is often lower than the chassis capacity.
  • Towing unbraked trailers above your state's limit – many states require trailer brakes above 3,000 lb, California above 1,500 lb.

Assumptions and limits

  • Checks based on manufacturer ratings and the NHTSA tongue weight recommendation; trailer brake requirements and license rules are state law and not checked; no legal advice.
  • No assessment of commercial or special regulations.
  • Axle loads of the tow vehicle with tongue weight are not calculated (see the bike rack calculator for the leverage).

Sources and background