EDIT: sorry, didn't intend to turn this into a build thread. haha.
The bed was custom made back in the 80's, so no manufacturer. I robbed it off another wrecked truck ('73 F-350), restored it, and made it fit mine. The bed is channel and plate steel with a turn-over goose neck. The sides (removable with pins) are just bent up square tubing. Headache rack is just square tubing and flat bar. I designed the cut outs and had them cut on a CNC. I replace every wire and all the lights with LED, added the light panel to the back, and made the step bumper work simply because it's different than every other flatbed you see and boy is it nice for getting up into the bed! Bed is simply bolted to the frame with plates and 1/2" GR8 bolts.
I got the truck off my uncle's farm in pretty tough shape and not running. Been sitting for over a year. Stock bed had been hit by a tractor, so it was shot.
The bed was welded the COMPLETE length of the frame rails to the doner '73 ford, so I just hacked the frame in half and pulled it home like a trailer. Took a TON of gas with the torch to remove the bed from the old frame, but eventually it gave way. The bed and '73 sat in a field for 10+ years before I got to it, so it was in TOUGH shape.
hours with the grinder, some paint, some spray on bed liner, miles of new wire, a bunch of new lights and it looks like new!
No, this was probably not the safest way to support the bed, but worked well when it came time to back the truck under it.
Was a little scary laying under it doing the wiring... I bet this bed alone weighs 1200 lbs.
Added some chrome wheels off a 90's 1ton dodge and set the bed on and it was really starting to come together.
I spend about 6 hours cutting and buffing the paint and chrome and was AMAZED how well it turned out: