I'm running 2" BL, t bar crank, and shackles. 31x10.5/15 would rub the frame at full turn. since i put 1" spacers on they don't hit. I don't have a problem with fenders because mine are fully trimmed. I will be looking to go with something similar to 33x10.5 soon.

 

Reality is the wheel wells aren't big enough to fit 33's unless you lift your truck so much that when you flex your tires don't go into the wheel wells. You can fit them with a lot of trimming but you can only trim so much without getting into structural supports of the body.

 

I cut around the whole wheel well right where the little curve ends around the edge. Nothing has fallen apart yet and my 31's have a good amount of room.