['68 C-20]

Thanks, but no, that is not it, that is a regular step and tow. That one is about 6 inches wide at the top (the diamond plate surface) the one I am looking for as about a foot to 18 inches wide, it sticks way out the back of the truck and wraps around the rear bed sided about up to the wheel well openings. They were made to work on, we had a farrier around here years ago that had one with a small anvil on one side and a vice on another. I saw one on a plumbers truck once that he had mounted his pipe bender on. They were made to be a work platform. Kinda Ugly but they had a purpose.