Mirror

They all get sloppy where they won't stay in place where you put it. and after driving the wind will move it ever so slightly, but enough on a Class C that you can't see what you want to see.

Mine was the passengers side where I couldn't safely move over on many occasions. :R

I bought a piece of clear tubing they use for fish tank water air pumps. Cut it fold it and stuff it in you can't see it and the mirror hasn't moved since.