FIFTH WHEEL WEIGHT CALCULATOR — VERIFY YOUR PIN WEIGHT
Enter fifth wheel and truck specs. Verify pin weight and confirm your truck’s capacity in seconds.
Fifth Wheel Kingpin Weight Calculator — Is Your Setup Legal?
Kingpin weight is not the same as trailer tongue weight. Get the fifth wheel maths right before you couple up.
Enter your trailer configuration and axle weights. The calculator returns kingpin vertical load and checks compliance against SAE J2807 and your truck’s fifth wheel rating.
An overloaded fifth wheel coupling can fail without warning. SAE J2807 fifth wheel ratings and vehicle kingpin limits are separate from payload ratings.
Semi-truck operators, RV fifth wheel owners, and anyone pulling a gooseneck or fifth wheel trailer.
- SAE J2807 fifth wheel tow ratings
- FMCSA axle weight limits
- State commercial vehicle laws
CALCULATOR
Disclaimer: This tool is provided for educational and informational purposes only and does not constitute legal, safety, or professional advice. Sunferno Automotive Accessories cannot verify how products are installed, used, or attached in your specific vehicle or situation — proper installation, use, and securement are solely the responsibility of the user. Laws and regulations vary by jurisdiction and change over time; always confirm current requirements with your local authorities or a qualified professional. Sunferno products must be used strictly in accordance with manufacturer instructions and applicable regulations.
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