I have looked everywhere for several months now and can't find rims to replace the 20 in 10 bolt 7.25 " circle rims on a 1952 6400. This made me wonder if there is a possibility of replacing the hubs to use modern rims. Any ideas?

1954 Chevy custom 261CID, T-5 5 Speed.
1952 Chevy 6400 2 ton hydraulic flat bed.