There are relatively inexpensive wheel pad scale sets an individual can acquire. One vendor has a four pack and then one can add individual units.The least expensive mode was two four packs. Each scale is a complete unit with no central box, so one has to crank up the old pencil to get totals of each end of an axle, all the axles, tongue weight etc.
My "local" CAT scales are 35 miles one way in the opposite direction for most of my trips.
The challenge would be finding a truly level spot to place a nearly 50' rig and get all parts upon the pads.
WBCCI Life Member 5123, AIR 70341, 4CU, WD9EMC
TV - 2012 Dodge 2500 4x4 Cummins HO, automatic, Centramatics, Kelderman level ride airbag suspension, bed shell
2014 31' Classic model 30 twin beds, 50 amp service, 900 watt solar system, Centramatics, Tuson TPMS, disc brakes, 16" tires & wheels