I just tried out some 33x12.5's on my truck since I put in the 2" body lift, they rub! Just a little on the bottom edge of the fender very inside, but this is all at ride hight, a little compression and they're going to really contact. I think they would fit if I had more backspacing, these used wheels I picked up for $10/ea have only about 3". I don't see a good way to trim this without loosing the rolled edge on the fender bottom. I think I'll have to take a 5 lb spedge to it and pound it back.
What do you figure? and no I don't want to find different wheels, these look cool sticking way out, fender flares here I come!!