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Tube types are harder to find, there are 3 that I know of - Diamond Back and Coker... problem is Coker have a lot of dissastisfaction with balancing issues and people post some bad things about Coker's tires. Diamond for their white wall (tubeless) takes a modern tire grinds the sidewall down and then bakes on a new white sidewall - no balance issues and they wear like a new tire... cause they are.
Side note, I have Coker rims (not really coker - they resale specialty wheel, etc) and have no issues with them other than the beating I took on shipping.
If you are anywhere near some rural areas, call a local grain Coop. They mostly deal in semi tires (farmers have semi's now to haul home the grain), but they deal in tube cause of the old implements.
There is a 3rd that I can't pull off my tongue at the moment, but other than those 4 sources I've found nothing - pretty limited options.
I don't know that you can't use a tube inside any tire. If the tire is a radial, you have to use a radial-rated tube. Almost all motorcycle tires are made for use with or without a tube, because many bikes still use wire-spoke wheels.
I don't recall from your prior posts whether the wheels on this truck are locking ring style or widow maker style. If widow makers they should be replaced. As for mounting radials, I've read that the bead profile of modern radials is shorter than the bead profile of tube type truck tires. This can result in rubbing of the sidewall above the bead and lead to premature tire failure. I'm with tinman52, get professional advice.
As for a source of original style tube type tires, Universal Vintage Tire sells the STA brand tires. Stands for Specialty Tires of America, made in the USA. Stu
I'm not certain on the difference in styles but the locking rings on his are solid circles, no split is that the better of the split rims? Are they safe enuff. To warrant putting new tires on em?
He did stop by one of the few places he thought could do the rims but they really only had. A couple tire choices to offer and he thought they were pretty expensive.
That one is a locking ring style. It looks like a solid/continuous ring design, but is still serviceable. Might be a Firestone "RHP". You'll want to make sure they are all alike, i.e. no widow makers at other corners. Stu