Dave,
You are correct - it is just a decorative trim piece. I had to replace a vertical section on the curb side, rear outside corner of the TM body. Last December the bag seals froze while the unit was open. As I closed the inner shell the frozen bag seal got hung up on the lower end of the trim piece. That resulted in a split down the middle of the vinyl. I was afraid continued operation of the inner shell would eventually tear the bag seal. The vinyl molding strip is standard, can be purchased at any RV dealer - and is fairly easy to install.
https://www.berrylandcampers.com/rv-...ctid=2744&js=n
Dick