should fit, i almost did 285s then got 265s. others have ran them without problems.
also i pull a trialer all the time, 6800lbs behind the truck a couple weeks ago.
what u talking about heavy loads?
i ould just be woried about with the load, how well the tire will fit. its close with 265s
couple pics with 265s, but with 3 inch body lift. this worked fine without the lift, im guessing it will with the 285s also.