Someone managed to clip my hitch mount bike rack while backing out of their parking space adjacent to mine. Didn't even leave a note or anything either . Just came back to my car to see that the trays were rotated in the completely wrong direction, which sheared off the metal bit that held the tray in place.
I gotta say though, that I'm impressed with the 1up rack. The only damage seems to be the underlying tray that holds the rails, which seems to be bolted on, if I can get a replacement from 1up it should be an easy fix since everything is bolted together.