Guessing these are the Budd rims?
My dad inherited a ton of those types of tires with rims that were sitting around for decades on my grandpa's property when he sold the place. I had a good week or so of breaking down tires with a tire maul when I was a teen. Ended up with a filled a 14 ft flat bed trailer stacked 5-6ft tall with the tires that had this style of rim. I also had to do the ones that were open in the center which I suspect is the Dayton rims. There were some truck tires that were the normal drop center rim like modern car rims too. There was a bunch of smaller truck and car tires too, but those were easy for the most part.
Not sure if the images above stand out super well, the top one is a 2 piece rim (the ring is split), bottom one is a 3 piece rim (solid ring with a locking clip).