Here are pix of mine
Called Tiffin service, and the tech said that since I can't see any screws it must be self-adhesive surface mount. I tried to pry off the bracket, but it ain't budging. I'm thinking of using a heat gun, but on fiberglass I'm a little worried. Maybe it woiuld be better to just grind off the old fitting with a Dremel?
Anyway, here are pictures of the lamp assembly I popped out of the holder, and the holder itself (still attached to the Phaeton). The lamp assembly didn't photograph well, it appears to have some circuitry inside the encapsulation.
I may just fill the assembly with epoxy or marine putty, then just glue a new lamp assembly to that.
2005 Phaeton 40 QDH
2013 Honda CR-V