There are many solutions to try. None of them make it "easy"
I used this: https://smile.amazon.com/Rapid-Remover-Adhesive-Graphics-Stripes/dp/B006RUJ2D8/ref=sr_1_9?dchild=1&keywords=adhesive+removal&qid=1613164827&sr=8-9
"Rapid Remover"
I tried Goo Gone, 3m Adhesive Remover, and a scraper on my drill.
I had a 35' fifth wheel and all the decals were turning to ****. It was a loooong process. The trailer turned out totally white, except for the fading around the decals.
Good luck, and be patient!