I jammed bubble wrap inside both the jack access bays.

I'm putting a solenoid in the rear latch soon.

Dealer says it was the exhaust. (getting a new muffler out of it so I'm not going to debate that)

I basically ripped apart the inside of the truck from the bumper to the door and didn't find anything loose. I readjusted the door jam in the back in, its more snug now but it still persists.

Its worse when the inside of the car is hot. Doesn't do it in the morning when its nice and mild.