I just got a pair of the CTM4000 from eTrailer and used them for the first time last weekend. They are not perfect, but I think they are the best we are going to find for our trucks. There was some vibration, but not too bad - certainly stable enough for me to tell if there was a vehicle there. And I don't think there is any way the mirrors are going to fall off if they are installed properly.
My only issue - one of the mirrors (the glass itself) had fallen off from the mount in the box. Looks like they use double-stick tape to hold them on. I reattached with a better adhesive and everything was fine.