A friend has a Blazer with 33x12.50-15 BFG AT tires on 15"x8" Rallys and they seem to fit fine. He doesn't 'wheel it much, but he says that they did hit a couple of times.
I have 32x11.50-15 Bridgestone MT tires on 15"x10" Eagle 063s and the when the front tires were pretty new, they would nail the "fang" when turned to about 2/3 lock in either direction. They don't hit now that they're pretty well-worn.