Sometimes when I hit aggressive enough bumps in the road the left rear will make a kind of thud while the right does not. I know it is the rear because I went over the bump really slow and heard it from the back. I know the rim is bent back there but that is not the noise.

I looked at the spring and it looks fine, bounce tested it, no noise and the strut still seems to be good. The bushings on the strut arm look good. It's not that complex back there so I'm at a loss.