I know !
Total Trailer loaded for a week w/full water and propane = 16,400#
Axle weight = 12740#
Pin weight = 3660#
22.3% pin weight
Easy way to get weights is truck stop with scales. Position truck so front axles are on 1 scale pad, Truck rear axle on a different scale pad, and the trailer on the 3rd scale pad. This will give you loaded weights on all axles.
Next step is to position the trailer so landing gear is on the same scale pad as the trailer. Un-hook so trailer is by itself on scale. This gives you total trailer weight.
Simple subtraction: Total Trailer weight less axle weight = pin weight.
Randu