Try the custom AI to help you find products that Reddit loves.
Not OP, but I bought these and they're amazing so far. Still need to go on a full road trip with them. From the picture in the amazon link, they fit on the lower part of the mirror and have a nice rubber pads. They dont strap on like OP's mirros and they're very study and do not wiggle around while driving.
Dometic DM-2912 Milenco Grand Aero3 Towing Mirror - Twin Pack
I use these when towing, and take them off when I'm not.
Yeah, I was looking on Amazon and the ones I saw looked really sketchy. Is this similar to what you had? This kind of clamp looks like it might just fly off at speed.