Neal asked me to help with the design and fabrication of a flat bed trailer. He'd already acquired plenty of steel for the purpose as well as old tread plates from a car carrier. These are very strong aluminum extrusions and we used them for the deck plating as well as the tailgate. The tailgate disassembles into 2 pieces to form ramps. One end of each ramp has a hook to catch on a lip on the rear of the load floor.
Here's some pictures of the layout:
And here it's mostly finished. The tailgate-and-ramp parts aren't designed or built yet.
The axle, wheels, tongue, toolbox, flower patterned panels, and load floor were all salvage. The lights, wiring, and angle steel were purchased new.