Well, an update: I just installed Dunlop Radial Mud Rovers in 315/75R16 on a spare set of factory alloys. The tires are acually Treadwright retreads using Dunlop casings. They stand 33.75" loaded. Not much of a power loss over the 255/85's. At $95 a crack, with a 25K warranty, I thought I'd try them. They were shipped to me for $450 to my business. I even mounted them myself on my buddie's tire machine. I have Dynabeads on order to balance them, but they are pretty smooth without any balance.
With 3.5" of lift, they fill in the fenderwells very nicely, like the 80 was made for 35's.