Paint is all about prep. The prep job determines the whole outcome of the paint. Don't skimp on the prep. Im sure you will hire it out, and don't be afraid to ask about how they prep the body. One cut corner on the prep work and the paint will blow right off with a pressure washer in 2 months. Ive had it happen to me on work trucks when I got screwed by a body shop. Also, I recommend having tree trucks done in a single stage paint. You don't get the highest shine in the world, but it is very shiny, but its cheaper to have done, and very durable. Plus, scuffs and scratches hide well on single stage paint, and scuffs and scratches happen eventually. All my stuff gets done in single stage.