Here's a bed I built about a year and a 1/2 ago.
Farmer friend bought a 2006 F550 crew cab 7' cab to axle 4wd 6 leaker at an auction for $5000, and needed a cheap bed.... The works, gooseneck, rear hitch, stake pockets, headache rack, trailer plug.
So, you bring all the stuff by, I'll built...