JK tailgate hinges are known to wear & rattle. Is there anything else on the back? In my case, I have a rattle from the back ever bumps, but it is from the UHF antenna spring mount.
If you open the tailgate & try lifting it, does it have any movement? (Maybe take the tyre off first!) That will give you a better indication of wear in the hinges. I suspect it might be bouncing up, then coming down.
Another thought. Does it have a lift fitted? When I got mine 2nd hand, I had a clunk that came from the back through dips or bumps. That one was from a bolt... it was in an ARB track bar relocation bracket, and was way too long! Whoever installed it put in a bolt & didn't look at what it might hit. Practical upshot was that when the suspension moved enough, it caught on the sway bar/ Whan I finally found it, the bolt was bent & there was a groove worn 1/5th of the way through the rear sway bar!
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Jeeps: Lego for grownups!
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