I had this same issue. My cab was laminated so you might not want to try this if yours is painted and you don't want to damage the paint.
I used the heat gun (ok, actually the wife's hairdryer - don't tell her) and pulled the sticker off. This left me with a mess of glue. I tried a bunch of stuff before finally parting with $4 for something called "Goof-off". Stuff worked great. Wipe it on the glue, let it sit for about two or three minutes and scrape with a plastic scraper with a rag wrapped over the edge (keeps it from scratching the laminate).
Good luck.
