I made a beefy-as-heck stainless headache rack for my truck a while back. I even incorporated a channel across the top and bolted in a section of utilitrac, and welded on a nice CB antenna mount.
Now I've got a camper shell, so I don't need the rack anymore. But nobody on CL seems interested so far.
I mainly used my headache rack to support long items (ladders, sheets of plywood, lengths of steel) up over the cab instead of hanging stuff out the back of the truck. It's especially nice if you have to carry long stuff but you also need to park in a tight spot.
Anybody need a 50-pound stainless headache rack?