It's just a lot of metal to metal contact back there. The body gets very weak where the mount attaches, and will allow all kinds of extra flexing. But see where and if any metal looks like its rubbing other metal. Place a bufffer if possible, and see what happens. Better yet, get a bumper-mounted tire carrier.
'82 Scrambler - NV4500/4.5" lift/33" Toyo MTs/4.0/twin stick, and my windshield washers work! Full 1/2 cab Cage
2004 Grand Limited 4.7 HO - OH Boy!
2010 Grand Laredo 5.7 Hemi - SICK - work vehicle -gone - replaced by an 08 Tahoe - nice ride.
"Both my Doberman and my Jeep can accurately be described as 'black and rust.'"
"I got a fever . . . and the only prescription is more cowbell"