The drive system and the supports are plastic and are easily broken. If you are the only driver, You can glue a piece of hard rubber to the bottom of the glass, between the glass and the outer cover and save the two hundred dollars for a new mirror. I did this for several of my customers.
1998 Pace Arrow 35 ft. F53 Ford V10 2012 Honda Civic toad
15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.