Towing Margin Calculator
Estimate the safety margin between your tow vehicle rating and the loaded trailer weight.
Common questions
- How much towing margin should I leave?
- Aim for at least 15–20% below your tow vehicle's max tow rating for safe reserves in wind, hills, and hot weather.
- Does tongue weight count against payload?
- Yes — tongue weight sits in the truck bed area and counts against the truck's payload, not just its tow rating.
- What is GCWR?
- Gross Combined Weight Rating — the total of loaded truck plus loaded trailer. Exceeding it is often the real limit, not just tow rating.