Park the coach so the sun heats the front. Get some plastic razor blades, some mineral spirits and some laquer thinner. Using the blades, get an edge lifted then slowly pull at a slight angle. It may come off in small pieces. Soak the adhesive that will be left with mineral spirits, scrape the goo, repeat. Finish cleaning up with the laquer thinner. Wax, polish the paint when done.
It may take hours and it will be a lot of work. I removed mine while staying in Myrtle Beach. Worked on it 3 hours each morning over a few days.
Some folks got a steamer and said that worked well. I tried the heat gun but it did not work any better than letting the sun heat the film.
I tried Goof Off and Goo Gone and it did not removed the adhesive as well as the mineral spirits and laquer thinner.
2019 Grand Design Solitude 384GK 5th wheel. Glen Allen, VA