Would this have an RPO Code

[special-K]

Up until the early-70s, most states did not require a safety inspected for trucks. So a bumper was not required to register the truck. GM actually used a tag mount mounted to the bed under the tailgate for trucks that didn't get an optional rear bumper.

That hitch is an aftermarket accessory. Hickey offered them and GM may have offered those in their accessory program. I'd have to look at a catalog to be sure. Those hitches were commonly used and were the better choice at that time. Most folks used "bumper hitches" in that time. A two inch receiver frame mount was a rare sight on these trucks. Reese was about the only, if not the only, company that made those. I know I grew upo knowing 2" receiver hitches as "Reese hitches"