That too. Don't know about the '05's, but on JK's '07 to current, if you go over a 33" tire you need to get a new tire carrier, or the extra weight could bust up your welds, especially if you wheel with the spare on the carrier.
For 33" tires and aftermarket rims, you usually need only to buy new bumpstops, since the backspacing on your rims will be different than the stockers.
Again, not sure how much of this applies to an '05.