Estimates plan; scales measure. Two or three passes over a platform scale replace every percentage guess on this site with your combination's actual weights.
Method: CURT & Weigh Safe (not CAT's — theirs covers scale positioning)Reweighs are cheap — ask at the fuel desk
The three passes (keep the load IDENTICAL between them)
Same occupants, same fuel, same cargo, same hitch hardware on every pass. A passenger who gets out between passes just changed your tongue weight by their body weight. Position per the scale's platforms: steer axle on platform 1, drive axle on platform 2, trailer axles on platform 3.
Pass 1 — loaded truck alone. Trailer disconnected. Record steer, drive, and truck total.
Pass 2 — full combination, WDH bars UNTENSIONED (or removed), trailer jack fully raised. Tensioned bars shove load onto the steer axle and trailer axles — they hide the raw tongue weight. Record all platforms + combination total.
Pass 3 — full combination, WDH tensioned exactly as you tow. This is the ticket that checks your axles as they'll actually run. (Fifth-wheel/gooseneck rigs: no bars — two passes total.)
The denominator trap: gross trailer weight = combination total − truck-alone total. It is NOT the number under the trailer axles — that platform doesn't feel the weight your truck is carrying. Divide by the platform number and your tongue percentage reads falsely high (see worked example below).
Pass 3 → actual loaded axle checks (travel configuration)
Full axle weight vs GAWR — not the increase. Your rear axle's rating cares about everything it carries, not just what hitching added. And a platform scale reads axle groups, not corners: it cannot see a side-to-side overload (Escapees' SmartWeigh program exists precisely because platform tickets "can actually give you a false 'safe' indication"). Wheel-position weighing is the gold standard when you can get it.
Method: CURT (weigh vehicle alone, then hitched with trailer wheels off the scale — "the difference is the tongue weight") & Weigh Safe; fifth-wheel variant per etrailer. WDH redistribution: Weigh Safe. Platform positioning: CAT Scale how-to-weigh. Side-to-side caveat: Escapees SmartWeigh. Reviewed July 2026
Worked example — including the trap
Pass 1: truck alone 7,120 lb. Pass 2: truck axles hitched (bars untensioned) 8,090 lb; combination total 15,500 lb. Raw tongue weight = 8,090 − 7,120 = 970 lb. Gross trailer weight = 15,500 − 7,120 = 8,380 lb → tongue = 970 ÷ 8,380 = 11.6%. The trap: the trailer-axle platform read 7,410 lb; divide by that and you'd get 13.1% — a phantom 1.5-point error from using the wrong denominator.
Once you have the real tongue weight, take it back to the ratings check as a measured value — it replaces the whole estimate band, and the "depends on tongue weight" verdicts resolve.