Backspacing will make a big difference...the less you have the more likely to rub on the fenders 3.5"s...have to keep it at least 4" or you'll start hitting the upper arm. Mine are 4"'s....running the 285/75/16. I would have to do a lot more trimming running 12.5 wide. Also note with 33's you will feel a power loss though not horrible.
1987 - FJ60, 202k, OME lift, 32's and that it so far.