Are you referring to the tiny stripe of caulking at the top of the rain gutter? There's a butyl tape caulk behind the rain gutter. The usually-white caulk above that is mostly decorative. You can scrape it off and use a non-silicone caulk.
The vinyl trim is readily available on eBay and Amazon in lots of interesting colors. I've replaced it on both trailers. It can be a pain to terminate the ends the way the manufacturers do--by wrapping it around the end of the rain gutter. You can also trim the edges of the part that extends past the rain gutter and stuff the rest behind the vinyl but in front of the rain gutter.
You can easily put the molding on with just your thumbs. It can shrink. On our 38' trailer it shrunk a lot. When I replaced it the second time, I left a couple of inches hanging over at both ends. Once it's shrunk for a year I will terminate it.
A lot of RVers have given up on covers, including us.
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Larry
Sticks and Bricks: Raleigh, NC
2008 Cherokee 38P: at Ivor, VA permanently
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