Originally Posted by Gord
...<snip>... You do need to be sure to wipe off the vehicle door where the mirror pad rests against the door, to avoid trapping any grit in there....<snip>...
I used a similar "strap-on" set of mirrors when we first got our 1707T and were pulling it with a Nissan Frontier.
I was concerned with the mirror pads rubbing against the paint on the doors and so I applied clear plastic tape to the doors after cleaning them thoroughly at the point where the pads rested. The tape was practically invisible when the mirrors were off and having it between the pads and the paint kept any scratching from happening. When we traded up to an F150, I removed the plastic tape and the doors were undamaged.
The strap-on mirrors worked very well for me using the Nissan, but I'm much happier now using the slip-on CIPA mirrors that are made for the Ford (the kind mentioned in the second post). They are available at Camping World too.