Well, it would seem to me that unless ALL the weight was behind the rear most axle the weight would increase. Kind of like a teeter/totter. put all the weight behind a pivot point and the lighter the other end will be. If you put weight on top of the axles then weight is spread through out the frame and the pin weight would be heavier.
[SIGPIC][/SIGPIC]2016 Newmar Dutch Star 4369
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USAF 1966-1969,- Law Enforcement 1969 - 2003, Retired since March 2003