White is the best when comes to lettering. I just recently had two of my trucks painted white. Now they all are white and have lettering on the side. One thing you may want to look at when getting your truck lettered. The tail gate is a good place to advertise your business.... There was a guy I saw in a turf mag that had all his trucks painted PINK. He said that they really stood out and people recognized the trucks when they saw them.