best way to remover stickers from a 2011 tiffin open road

Each year I remove some of my decals as they shrink and peel. I just park the camper in the sun and they literally scrape right of as they warm up. Sometimes I use steel or plastic razor blades to help them along. All residual glue comes off with the Goo Gone.
Once off, I tape the old outline, scuff the surface with scotch brite pad. Clean with thinner and then spray paint. Has been coming out great. Just needs to be calm day with low humidity.