Stahl Service Bed.  This was on a 70s/80s Chevy pickup.  Has a fuel tank in the front.

Approximately 10ft long and 7.5ft wide.

It has some superficial rust on the floor.  Overall is solid.  Opening on the front is 58" wide so it can be used on truck with wider frame rails.

Approximately 57.5" from center line of wheel arch to front of bed.