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Motor Wheels, hub piloted, uses retaining nuts with a heavy washers, available in multi-piece design,(I've never seen a tubeless one or an RH5 version), used on many makes of trucks, GMC and Reo to name two...
By now the discussion is not about "Motor Wheels" but I'd like to point out that they did make some 22.5" tubeless "Motor Wheels". I've seen a few and have one.
https://picasaweb.google.com/lh/photo/27f7Z2eadDH0BiN4RYzphNMTjNZETYmyPJy0liipFm0?feat=directlinkMight want to correct the bolt circle diameter to read 7.25"
The ideal thing would be to find 22.5 wheels for tubeless, but they are very difficult to find.
These wheels
https://picasaweb.google.com/lh/photo/VrjmxQELviMGsRliyeSPK9MTjNZETYmyPJy0liipFm0?feat=directlinkI agree. If you want tubeless wheels for this truck then you're looking for only one possible wheel. They were available on 56-59 Chevy 1.5 tons and the rim is 5.25" wide x 22.5". To run 9R22.5 tires you really ought to have a 6" wide wheel but you can't get that with a 10 lug on 7.25" bolt circle unless you have them made, and that is tough to do. I have mounted 9R22.5 tires on my old 5.25" wide wheels and they mounted easily and have given no trouble, so while not recommended by the book it seems to work.
Grigg