⚠️ Guide only — not a substitute for a certified weighbridge check.
Always verify actual weights at a weighbridge before towing. Laws vary by state — confirm with your local road authority.
💡 5th Wheeler notes: Pin weight (kingpin load) replaces towball mass. Ideal pin weight is 15–25% of trailer GVM. Pin weight loads the rear axle of the tow vehicle — enter it in vehicle load fields above too.
🚙 Tow Vehicle
📐 Axle Load Estimator — optional▼
Estimates front and rear axle loads under tow. Requires wheelbase and hitch overhang to calculate how towball mass transfers through the vehicle. Find axle ratings on your compliance placard.
Front Axle Load—
Rear Axle Load—
⚠️ Axle load estimates assume uniform load distribution within each zone. Actual loads depend on exact seating positions, cargo placement and suspension state. Always verify with a weighbridge per axle.