Well... Last summer I was coming home from work. Dark and rainy. There was a dog sitting in the middle of my lane (of couse). The dog didn't move, so I did. I took the shoulder and fish-tailed it pretty good when coming back onto pavement. That'* the only thing that could of done damage... if any.
But that would have stressed the bearing and suspension on one side primarily. You're saying both rear bearings are loose.
lol... No, I never noticed any vibrations coming from my rear.
Both sides are hashed. But the passenger'* side is the worst.
Earlier today I took it around town, and almost every corner I took, one of the back rotors would tilt enough to rub up against a brake pad and make a pretty nasty moaning noise (new pads = closer to rotor). I have 4 new hubs sitting in the garage now, so I've got a busy weekend ahead.