[blucar]

The wheels shown in #1 of this topic are the Firestone type which were in common use until late '70's on light/medium duty trucks. This type of wheel is not the infamous 'widow maker'
The two piece rim with the center lock ring similar to what 'petehoove' posted are the problem type.
Tubeless tires on trucks is what actually stopped the split rim use. I changed out all of the tires/wheel on my fleet of trucks in the late '70's in favor of tubeless because they were safer.