While looking for replacement tires I can't decide between a D-load or the E-load rated tire, specifically the Cooper Discover S/T. I would like to go with the LT285/75R16 which has a D-load rating but rated for 3305lbs, the 265/75R16 is E rated @ 3415lbs. What handling characteristic's could I expect between the two with a fully loaded camper weighing approx. 3200lbs. Would it not be wise to go with the 285's??? Of course the dealer is telling me " Suuure, you'll be fine, go with the 285's".