wow...and i thought i was the only one with this rear rattle....it happens when i hit a bump....IT'S THE REAR DOOR LATCH!

i was rear ended when my car was brand new (i only had 3,300 miles on it) i've had it back to the bodyshop, the dealer several times because of the ratte.

i tried all the suggestions posted above, pad on jack handle, the strap for the seat, seat hinges, rear door lock mechanism and riding in the back till i was ready to barf.

i tried putting some foam into the door wedge to snug up the fit...this helped a little...previously i had moved the door wedge forward but it still rattled.....

finally i tried adjusting the wedge again. this time i moved the top of the wedge forward and the bottom back. so it points down slightly. this helped alot!!! i still use a thin (1/8") thick piece of foam (cut gasket material) pushed into the wedge "reciever" and for the first time the rattle is gone....

stan