Boils down to basic physics plus impact of WD hitch. Adding weight in back of axles will reduce hitch weight, but can be reduced by adding weight in front of axles (personal gear, food, water if tanks are in front of axle, etc.). But the WD hitch will reduce the amount of weight. Add in the factor of axle placement (think of changing the fulcrum point of a see-saw) and the hitch weight may be more or less. So, IMHO, the weight factor will vary from one toy hauler to another and can be verified by a couple of trips to the scales...once without the tows and then with the toys loaded.
