Most after market removable towing mirrors vibrate more than factory installed mirrors. A lot of people complain because they expect them to be as good/better that the ones attached to their doors. NOT GOING TO HAPPEN.
Find the ones were people say they fit tight to the RAV's mirrors, with no fear of them coming loose or flying off.
I ordered a set of CIPA mirrors designed to go over my trucks mirror--looked like a custom fit factory accessory---they stunk. Went to Walmart, bought a pair of one size fits all adjustable CIPA mirrors with rubber straps and a buckle that held them to my truck mirror. The mirror itself could be adjust 360 and extended farther than the "custom" mirrors. Easy on, easy off, did not scratch my trucks plastic, no fear of them coming loose. LOVED EM.