Thanks for all the suggestions. I decided to go the replacement route suggested by Harry and picked up a 3/4" x 25' roll of Camco 'RV Vinyl Trim' from my local dealership.
It took about 30 minutes to work it into the channel all the way around the door, and it's back to looking like new now. We'll see how it holds up through the fall and winter temperature changes.
The 3/4" does seem to be the correct size for the channel, although I didn't measure its exact width.
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