I have a 2016 Thor Axis 24.1. I have had issues in in the past with difficulty driving up or down sloped driveways and being careful to not bottom out. Recently I drove down my sloped driveway to get the propane tank filled and when I returned I tried to back back up the driveway following a similar path as used to leave. I bottomed out and did some damage to the left rear corner of the RV. There is a corner piece there where the side of the RV joins the rear of the RV that is screwed in place. Can anyone tell me where to order this piece and if anyone has had to make this repair before, I would appreciate some advice? Thanks. Any suggestions on how to avoid this in the future, other than being more careful and using a spotter, which I usually do?