Constant rattles in the rear passenger side when driving over any change is road. I know its not the shocks or springs, but what is usually the culprit with the rears suspension in these vehicles?

Bushings, end link or control arms? Or, should I just all three to see if that fixes

 

Make sure it's not something rattling around the spare tire or in the trunk.

If it's loose suspension you should be able to move the parts with a tool for leverage while it's secure up on jack stands.

 

Sadly, I checked the trunk already! lol

But I will be putting the car up on jack stands this weekend and see what is going on. Thanks for the update.

 

take a good look at the lateral links between the wheel bearing assembly and the inside wall of the wheel well. They fail over time (either the bushings fall apart or the bolts corrode and no longer hold the link in place).

 

Check the sway bar bushings. Mine are shot and rattles sometimes.

 

also check the springs closely - they tend to break on the Gen1s about 2 inches from the end and it can be tough to see - but I'd guess sway bar bushings/end links as well.