I guess I will be the first to chime in with a hitch mount.
I have the Yakima HitchSki.
I also have a 2 door and the roof mounting options were limited so I didnt go with that - plus I wanted to be able to carry my bike in the summer with the soft top so this was the perfect solution.
-No climbing on top of the jeep to get to your gear
-You can see all of your gear in the rear view mirror so you can keep an eye on it
-Very easy to load/unload
-Can remove it from the jeep as soon as you dont need it
-doubles as a 4 bike bike rack
-it has a secondary optional locking cable to secure your stuff
-It has a built in bottle opener
-It sticks out kind of far (not such a big deal for us 2 doors because we are short)
-If you have a rubicon tire or larger on the tailgate you can not open the tailgate without a hitch extension
If you want pics I can take some -- I have a drop-down hitch reciever that I use with it that makes it stick out an additional 8" but allows for the tailgate to fully swing open.