Your mirrors are probably Velvac. They supplied the mirrors to all the Rexhalls I have seen. Look at Pacific RV mirrors and see if your mirrors are on their site Pacificrvmirrors.com Once you have the model number, Velvac can probably help you with troubleshooting and parts, if necessary.
Also, check to make sure the mirror housing is tight. Just try moving the mirror housing. If it moves, there is a set screw in the mirror arm you can tighten.
Good luck!
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Jim & Lin
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