Bogey,
a construction tool box that flush-mounts inside the bed of a pick up
My brother has a Lund, made of metal and 48 inches long (so I suppose long enough for a bag and a modern driver) -- but he has a pretty big one ton pick-up with a wide bed, i.e. wide enough for the Lund to fit in snugly one side-to-other and tucked up right behind the cab. It locks in the front and opens from the top.
P