On my recently used YJ without any space in the jeep I had to dismount my spare and get a bike rack on my trailer hitch. A lot of awful work, twice a trip, and always one eye in the back mirror to check if everything is ok.
Now with a JLU i'd just put it in the back, we did that in a friend's JKU with three bikes and riders, worked well.
There are devices which mount to tire carriers or a roof rack I think, but I would not like to load the tailgate or tire carrier with a bike and rack since it could just be too heavy
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