Nice Truck the way it is but I can see wanting to do something with it.
Blue Plates came out in the 70's. A truck needed commercial plates but if you put a camper shell on it you could register it as an automobile instead of a commercial vehicle and get away from paying a weight fee. If you remove the camper shell you will have to register it as a commercial vehicle again or you can get pulled over and cited. Don't ask me how I know.