I love the look of rear tire carriers and roof mounted tires. But the rear mounted tire always seem more "efficient" to me because when you start thinking about a lifted jeep running 33" + tires its going to be hard as hell getting that tire up and down from the roof if you need it. Where as on the rear of the vehicle its easily accessible. With this said i still went with a roof mounted spare time for a couple of reason. First reason is most rear tire carriers are extremely expensive. Second, when running larger tires you can pretty much count your rear viability out of the question. Lastly and what was the deal killer for me, is that every time i want to get into my hatch i have to open and swing that damn tire carrier. I know it seems minimal but i get into my hatch a lot and it would be a huge inconsistence. So i went with a roof mounted!
Just my .02 cents.
1999 Jeep Cherokee Sport (red) - 6.5" RC Long Arm, 33" Mickey Thompson MTZ, RC 2.2 Steering Stabilizer, 2.2 Performance Shocks, OR-FAB Rock Slider Bumper, Smitty Built XRC 8.0 Synthetic Line Winch, Kargo Master Safari Rack with HiLift, Spare tire, and Jerry Can. *TOTALED* Stupid drivers! *US Army*