I did a bunch of wheelin on mine with a 2" BB, 31's, and No Slips front and rear. Any larger of a tire starts to need some fairly significant lift and/or opening the wheel wells. Just the reality of the XJ.
We would be looking at 31's, as well. Her little 2-door is pretty straight and clean, so the wheeling would be fairly light stuff, so as to preserve the rig.