In the 2010 brochure, for example the 287RL, GVWR is 11,600. Dry weight is 7,180 lbs. and hitch weight is listed as 1,440 lbs. If you use 12-15%of the weight of the FW, how do they determine 1,440 lbs hitch weight? I know the dry weight is not the way the FW sits on the lot, so if you add 10%...