Grandpa made a hitch when he put the flatbed on. It's welded onto the bed's frame and bolted onto the truck's. It's not going anywhere.
When I put the box on, I'm not sure how I'm gonna pull that off. I may get a class III receiver hitch off of a junkyard denizen and modify/cannibalize it to make it work with the truck.
It should be interesting, whichever way it goes.