i have a very similar problem that irritates me to no end. and i also sent my girlfriend to the back to investigate while i was driving.
i had two seperate causes...
one was just the plastic roof rack mount covers jiggling around in the rear side compartments. make sure everything in those compartments is out or secure. the second was just the spare tire cover not tightened down enough. one of my plastic red screws has been broken and it allowed the cover to smack against the door when i was going over things as small ad concrete seams. some foam between the door and the tire cover baffeled it pretty well.
i hope you find the problem, i know how irritating that repetitive sound can be....




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