I've removed decals on all my vehicles, snowmobiles, atvs and dirtbikes. The easiest I've found is to use either a heat gun or a hair dryer to warm the adhesive. For hardened emblems, heat them up and use a piece of fishing line like a saw behind the emblem. For decals, heat them up and peel them off. There will most likely be adhesive left on the truck. I use 3M adhesive remover in an aerosol can. Spray the remover on the adhesive and wipe off. You may have to repeat this step a couple times. You can get the 3M from a glass or windshield shop. Goo-gone will also work.