The video above is mine...glad someone found it and shared it here.
That was my Arctic Fox truck camper, which is 10 years old next month. This is the third section of that trim I replaced.
First failure was the nose (cabover). Made sense that it failed first because it see more direct sunlight.
Then the back wall trim failed.
Then the roof line (video above).
Curious what the build date is on your RV. I've seen "next model year" rigs being built in June of the previous year... so it's possible your unit had been on a dealers lot 1.5 years or more.