Nice looking bed, Caleb.
I built and painted a welding trailer a few years back.
After spraying the whole thing with primer, I used a black rubberized undercoat on the bottom. All of the wiring for my lights were already in place, and the rubberized undercoating helped to seal them in place and prevent them from getting scratched by sticks or whatever whenever I went through tall brush. (It might be hell to replace a broken wire later on, but that hasn't happened yet)
For the top, I painted it with this paint that they use on U.S. Naval ships. I got a gallon of it, and used a roller to put a nice, thick coat on it. I'm not sure if the Naval paint was super durable or if using a roller to apply it did the trick. It is a tough paint job, though!
http://joeswelding.biz/photos/P1000561.JPGhttp://joeswelding.biz/photos/P1000563.JPGhttp://joeswelding.biz/photos/P1000582.JPGOff topic: I noticed your license plate. How close are you to East Texas (Longview)?