My painter told me he'd knock off $500 if i worked on the inside of the bed. I sanded and sanded blending some scratches on the sides, but stripped the floor and tailgate to the bare metal... and hit it with some self-etching primer.
before (with flip handle opening)
after:
if you look carefully, you'll see the row of holes that held one side of the fifth-wheel hitch. (they get filled later)