Weighed my trailer the other day, the pin weight comes in at 12%. Had the fresh tank full which resides behind the axles. An educated guess is the pin will fluctuate from the low of 12% to maybe 17%...
Next year (already covered) I'll try it with the fresh empty and the other two full just to see what the range is. Both the grey and black are forward of the axle where as the fresh, which was full at the scales, is behind.