You will be able to get 22.5 tubeless rims that will fit on those hubs easily. That's what I did for my 860. I think I only paid about $100.00 each but that was a few years ago. Keep an eye for a manual on Ebay. I found my rims there too. It will be exciting to see the progress on the truck once you start.
~ Billy Old Dominion Stovebolt Society: Exotic Animal Division 1946 Chevrolet Cab Over Engine | In the Gallery | Video | More pictures 1959 GMC 860 | Pictures 1950 Chevrolet 3800 | Pictures I've got a trailer and I'm not afraid to use it!