Stick to 30/9.5s, you will get 31x10.5s on there (With spacers or adjusted steering stops (Much worse turning circle) ) but the worst thing is the loss of power... 5th gear can end up in semi retirement if you load the car up.
Also, if you do plan to play, you may find they rub on full articulation slightly. most people put a 2" - 2.5" susp lift or 2" body lift on with 31's. You can get a "Budget Boost" 2" lift from MountainJacks for about £150 I think (May be cheaper, can't remember)
I run a 2.5" OME lift on mine with 31's and love it.... Very capable and not scarey to drive fast on road still.... but it does drink the juice when loaded and you can't use 5th :)
Going bigger than 31's is a big (Read expensive) step.
Not got any "Normal Pics" but here's a wrangler with a 2" body lift
And here's mine with the OME Lift
This shows you why they might rub on full articulation with no lift