I had a guy clip my tow mirror with a weed whacker on a landscaping trailer a few months back... Darn near gave the truck some racing stripes too! I was stopped at a red light going straight and he was swerving around in the left turn lane when it happened, so I pulled up behind him after the strike. I thought the thing was broken for sure, so started to approach the driver to talk with him and he sped off. I was luck that the mirror appears to be designed to flip forward to. Threw it back into position, wiped off all the clumps of grass left behind, and was good to go. I always thought I was just being paranoid about those things sticking out so far even when retracted. There's a bunch of bozos around here in their lifted truck that leave them fully extended all the time.