Re: Metal vibration from right rear above 60mph
Presume you hear it from the interior given your troubleshoot list? A few others have spare tire shimmy as well but sounds like you covered that. Maybe jack and safety equipment?
May also want to check rear antennae post for tightness, and roof rail tightness and cross bar positions if you have them.
Keep chasing it down, dealer may help though put him or her in your passenger or rear seat while you drive to troubleshoot.
2011 JGC Oland Hemi / Borla Catback Proto / Hemifever Tune on DS Trinity / Flyin Ryan PTB / Volant CAI / Bwoody Sway Links / BT Catch Can & Underhood Kit / Jon's Tinted Tails / SRT8 Hood, Steering Wheel, Shiftknob, Pedals / Firestone Dest AT's & Winter 18's / Focal 165 Component Fronts, Alpine PDX 5 Amp, Rockford Fosgate P3 10" Sub & Fiberglass Enclosure / PS2 Grill, Mirrors & Liftgate Strip / Tow Hooks & Skids / JW Speaker LED Foglights / Debadged, Tint, Clear Bra / Sharkfin / Vled & Putco LED's / JRoll Uber-Tech Cabin Filter / RA & Yak Roof Rack / Lit Sills, Slush & Cargo Mats