I have a 53 GMC 2 ton that has the RH-5 wheels and I have not been able to find anything to replace them. I don't worry about driving the truck. I changed a lot of them in the 50's and 60's, but I quit doing it after I had a wife and kids almost 40 years ago. The centers are riveted and I have been toying with the idea if removing the centers and welding them to open center (Dayton) tubeless rims. I have welded other wheels like that in my brake drum lathe and had pretty good success. I always have a bunch of low profile 22.5 tires that are not good enough for my over the road equipment but would be fine on a bob tail that never leaves the county.