Razor blades work if you take your time. Haha just dont go in all hyped up and ready to get it off. If you take your time it'd only take about 10 Mins total. After you learn how to take the first 2 - 3 the rest is a sinch. A friend of mine and I took his pin stripes off his camaro in about 10 Mins!
Edit: Depending on how old the truck is there may be some "Ghosting" there