My tires measure 31 1/2 inches and that's about as big (tall) as you can go. I had to trim the front mud flap a little becuase it was hitting when the wheel was fully turned. I seriously doubt you could go any larger without a lift.
10 inches wide (265/70/17). I'll snap some pics of it this weekend and put them out here so you can check it out.
Actually the salesman told me they measured 31 1/2 but I remeasured last night and I only got 31 inches. So I would say a 31 inch tire will fit at stock height (requires a little trimming of mud flap). Anything bigger would rub to much when turning the wheel.