[blucar]

The 'split ring" type of wheel were very common up through the '80's on HD pickups and trucks up to 10/18 wheeler's. The majority of the trucks in a company I owned had that type of wheel. The two piece 'split rim', which Ford used a lot of on the one ton and larger are the dangerous ones, you cant see if the two halves are seated because they are covered by the tire.
Heavy duty radial tubeless tires pretty well did the spit rim in, blow-outs are a thing of the past if the tire is kept properly inflated.