Josh, like Donna my 1984 Scamp
13 has all plastic trim all around the bottom of the fiberglass shell. It is riveted approx every 6" or so for the complete circumference of the trailer. A few rivets have come out of the shell in a couple of places, the front left (street side) corner & the trim has 'shrunk' enough that it has disappeared under the trailer. I haven't yet bothered to move it back into position & re-rivet it.
My door trim is similar black plastic(?) with a metal 'core' all around the trim piece, including the 'arc' that protects the edge of the fiberglass door. From a 'scrape' that happened before I got the Scamp, it appears the metal core of the door trim may be constructed mainly of'fingers' side by side with the plastic molded around them (see pic #3). My door trim has absolutely NO rivets holding it to the door. Appears to be a 'friction' hold & it is loose enough that it may be time to replace??