The Thule hitch rack is by far one if the best. It is HEAVY - especially if you get the two-bike extension - and it sticks out a lot farther than a spare tire carrier, but there is no better way to carry your bikes on a Jeep (unless you have a roof carrier). I use it for my S-Works Tarmac & Stumpy at the same time with no issues at all (need to protect all that carbon). It also works great for my Transition (even with a disk on the rear) or my Gunnars. Any combo works great and I can even put my kids bikes on there. However, I can't open the back with the OEM spare tire on the back (doesn't clear the latch mechanism).
If I'm only carrying one bike, I can get it to fit in the back of the Jeep without a carrier without a problem (but with the Stumpy I have to fold down one of my back seats). BTW - I have the four door Rubie.
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