Bestop Oversize Tire Carrier
Heard positive things about it. What I like is you can use this tire carrier with any aftermarket bumper, and it also has two mounting points instead of putting all the weight of the tire on one small point on the bumper. Also, the tire carrier swings with the tailgate as a single unit, so you don't have to fuss with two separate things when you want to open the back of the Jeep.
If you leave a large, heavy tire mounted on the tailgate, it has the potential to warp your tailgate. It is recommended that a 33" tire be mounted on some sort of tire carrier to take the weight off the tailgate.