Record the travel condition
Record the date and a load-state name for each ticket. Note passengers, cargo, fluid levels, and hitch hardware. Confirm whether the trailer was attached and whether weight distribution was engaged. The combined ticket must represent the hitch mode you intend to evaluate.
Keep all equipment and loading accounted for between tickets. A changed passenger, removed hitch head, different water level, or unrecorded cargo makes subtraction unreliable.
Read each axle group separately
Steer axle plus drive axle is the vehicle’s mass on its axles in that measured state. Adding trailer axles gives the combined mass. For a ticket reading 3,200 lb steer, 3,800 lb drive, and 5,500 lb trailer axles, the vehicle is 7,000 lb and the combination is 12,500 lb.
Compare steer and drive readings with the corresponding front and rear GAWR. A vehicle can be below GVWR while one axle exceeds its rating. Tire load capacity and inflation remain separate checks; GAWR compliance does not establish tire compliance.
Use matched tickets for the trailer total
If the same loaded vehicle, with all the same equipment, weighs 6,000 lb unhitched, the example combination’s total trailer mass is 12,500 − 6,000 = 6,500 lb. Only confirm comparable loads when that is actually true.
With weight distribution engaged, the increase in vehicle axle sum is not static tongue weight. Measure static tongue load with the WDH untensioned using an appropriate method and equipment. This tool never derives tongue weight from a pair of mismatched tickets.
Do not add the passengers again
Scale mode uses the measured axle sums. People, cargo, liquids, and equipment already on the scales are not added to those sums again. The separate payload inventory still documents additions relative to the vehicle’s label baseline, so its completeness must be confirmed separately.
Without a matching unhitched ticket or an independently known loaded trailer total, some trailer checks may remain unevaluated. That is a useful partial result, not a reason to guess.