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Predicts Vehicle and Axle Weights When Towing Using an Extended Hitch

US Measurements (lbs, inches, gallons)

Step 1: Enter Truck & Camper Information

OEM Information:

Recommendation: Use weigh scale whenever possible as OEM info usually differs from actual.

DISCLAIMER: The calculations in this document have NOT been engineered nor reviewed/approved by a professional engineer. The calculations and information provided may contain errors and MUST NOT BE USED without reference to manufacturers published specifications.
Although this calculator is in the public domain, no guarantee is expressed or implied that it will serve the purpose the user intended.
By Clicking the "Calculate Results" button, you acknowledge that you have read and understand this disclaimer.

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  • Tire load rating can be found on tire sidewall.
  • Tire maximum loading will be lower when tires are used in DRW configuration.

Typical Hitch Ratings:

  • Receiver Ratings are typically marked on receiver.
  • Class I - 200 lbs Tongue Weight, 2000 lbs. Gross Total Weight
  • Class II - 350lbs Tongue Weight, 3500 lbs. Gross Total Weight
  • Class III - 500 lbs Tongue Weight, 5000 lbs. Gross Total Weight
  • Class IV - 750 lbs Tongue Weight, 7500 lbs. Gross Total Weight
  • Class IV (Weight Distribution) - 1200 lbs Tongue Weight, 12000 lbs. Gross Total Weight
  • Class IV/V - 1000 lbs Tongue Weight, 10000 lbs. Gross Total Weight
  • Class V - 1200 lbs Tongue Weight, 12000 lbs. Gross Total Weight
  • Class V - 1400 lbs Tongue Weight, 14000 lbs. Gross Total Weight
  • No WD - Up to 1,200 lbs TW / 12,000lbs GTW
    Weight Distribution - Up to 1700 lbs TW / 14,000lbs GTW
  • No WD - 600 lbs TW / 6000 lbs. GTW (with 48"Extension)
    Weight Distribution - 1200 lbs TW / 12000lbs. GTW (with 48" Ext)



  • Gross vehicle weight rating. The value specified by the manufacturer as the maximum allowable loaded weight of the vehicle.


  • Gross combination weight rating. The value specified by the manufacturer as the maximum allowable loaded weight of the truck, camper and trailer.


  • Gross axle weight rating. The value specified by the manufacturer as the maximum loaded weight on any single axle on the vehicle.
  • May be governed by State or Provincial Regulation.

Tire Ratings

  • The value specified by the tire manufacturer as the maximum allowable load that can be put on each tire.
  • May be governed by State or Provincial Regulation.
  • Dual tires mounted on the rear axle will have a lower rating than the same tire mounted on the front axle.
  • The maximum permissible load varies with the cold inflation pressure. Consult the manufacturers data for specific values.
  • Do not operate above the maximum pressure stamped on the tire sidewall.

Maximum Allowable Tongue Weight

  • The value specified by the manufacturer as the maximum allowable trailer tongue weight that can be carried by the truck hitch receiver using a Standard Ball Mount
  • Can be found stamped or on a label on the receiver.
  • Ensure that the ball mount has the same rating as the receiver.

Maximum Allowable Trailer Weight

  • The value specified by the manufacturer as the maximum allowable trailer weight that can be attached to the hitch receiver.
  • Includes both the weight on the trailer axles and the tongue weight.
Illustration Illustration

Receiver Torque

  • The torque (rotating force) applied to the hitch receiver by the hitch extension.
  • The torque increases proportionally with the length of the extension.
  • Typically, the manufacturer will not publish torque limits, but may provide ratings with extensions of specific lengths.
  • This calculation can be ignored if the manufacturer specifies a rating with a hitch extension. Torklift Superhitch provides ratings with their extensions.
  • Torque can be significantly reduced through the use of a weight distribution (equalizer) hitch.
  • A weight distribution hitch MUST be used any time the torque exceeds 100% of design.

Hitch Extension Length vs. Capacity

  • Receivers are rated using a standard ball mount length (approximately 11 inches)
  • An increase in extension length results in a REDUCTION in capacity
  • Exceeding the reduced capacity limits can result in bending the extension, failure of the receiver mounts due to increased torque and may cause the trailer to be disconnected from the truck causing a significant risk to yourself, your family and the general public.
  • Note: Does not apply to Torklift Superhitch or Reese Titan receivers.
  • Offered for information only. Always refer to OEM recommendations, specifications and limits.

How a weight distribution Hitch affects axle weights.

  • With no weight distribution hitch (Case 1), the hitch extension will act as a lever, adding weight to the rear axle and removing weight from the front steer axle.
    1. Due to the leverage applied, the weight added to the rear axle will always be higher than the actual tongue weight
  • By using a weight distribution hitch (Case 2), the torque bars on the hitch will reduce the applied leverage, moving weight from the rear axle back to the front steer axle and trailer axles.
    1. The effect is to reduce the tongue weight.
  • Tightening the torque bars has the effect of reducing the tongue weight effect further and if they are strong enough, may reduce the tongue weight to zero or even slightly negative. Note: This is for illustration only and is not recommended.
  • An advantage of the weight distribution hitch is it's ability to absorb and counteract the dynamic forces encountered during normal driving
    1. As the rig travel over a bump, curb or pothole, the rear of the truck will bounce downward increasing the loading on the torque bars.
      This momentary increase in torque bar loading will reduce the forces applied to the extension and receiver.
  • It is STRONGLY recommended to use a weight distribution hitch whenever a hitch extension is used. This does not typically apply to towing a car "4 wheels down" as the loading on the hitch is minimal.