Nice find. What's on the drivers bedside near the cab?
Looks like a door for an auxiliary tank (you can kinda see it hanging down)
That's exactly it. Steel tank mounted outside the frame. Odd it wasn't installed on the other side for better weight balance. Guy said his dad used it mostly for hauling cattle.
Talking about weight balance, after I installed the Ramcharger tank in mine, it rode soooooooo much better (I rarely carried anything), handled a little better, and the infamous drivers side lean was hardly noticeable.
If the original tank hadn't been cracked, I seriously thought about keeping it and having over 50 gallons of fuel capacity as I knew I'd be driving it out to (Phoenix) AZ from MA.
Probably a good thing I didn't.