I've ruled out the floor cover in the trunk, as well as any seatbelts. My dealer wants me to make an appointment so that I can take my service advisor for a ride to demonstrate the sound since they weren't able to replicate it. Not really sure how that's possible since it does it over bumpy roads and the dealer is surrounded by crappy roads. The amp is mounted behind the side panel on the driver's side in the backseat, correct? I swear it sounds like something heavy of that nature is loose.
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