Like everyone else that rear rattle drives you nuts. Well, I tried all the tricks and nothing helped, so I had my wife drive while I hunkered down in the back by the hatch. It wasn't coming from the hatch at all but underneath on the drivers side. Got underneath grabbed each shock and the drivers side rattled. Not from worn bushings but one of the bolts wasn't tightened down. Wrenched it down and no more rattle, just subtle squeaks here and there. With radio on all is good.

 

A louder radio usually eases your mind from stray Jeep sounds..