Ford made TT (1 Ton) truck beds that were metal with a wooden floor. They had slots for side boards all the way around and the wood floor had metal strips between the the boards. They made two different widths, one being about 6ft and the other almost a foot wider. Both were about 8ft long with Ford Truck stamped on the rear.
I can get the actual measurements if you need it, but I am not near the beds right now.