I've got the slip-ons from CIPA. I paid about $50 for the pair at an RV shop. For the money, they work well and have never come loose after 9,000 miles of use. On the other hand, I'd love to have some Power Vision or even the factory Dodge tow mirrors, but I just don't want to spend the $$$. BTW, the CIPAs do vibrate some but never enough to make a difference in what I can see or how they work.