Here is what a "friend" told me
There are only a few bolts that when undone release the rear bumper from the frame...
1 Two support bolts: one is located near the inner muffler region and the other symetrically on the other side.
2 Two more bolts at the very ends of the bumper in the wheel wells on support brackets.
3 There's one last bolt near the muffler, rather big.
I'd take pictures, but I don't have a jack and I can't fit my fat ass under the rear end.
Hope it's accurate and helps....