My '55 C600 has Firestone RH-5s all around, but I found a set of (4) tubed 9-20s. The truck has bad 8.25-20 recaps, some are soft and I am not dealing with them! I get to swap the wheels over for a grand total of $200. But if I wanted to keep the Rh's, $400 outright. I will still have the front wheels to replace, but I am making progress.