Bob Landry wrote:
Make a mounting surface large enough to cover the existing hole. Attach it with SS sheet metal pan head screws at the corners and run a bead of white silicone around the edge smoothing it with a finger. I used King Starboard, but any type of plastic tha can be worked with power tools will work.

Nice and clean install there.
The aluminum siding on my KZ is not flat like a fiberglass coach. Makes things a bit more tricky. I'll post up a pic when the sun comes back tomorrow, see what ideas you all can come up with.