Thanks for the reply GasHog!
I only recently learned about the balancing beads. I was very suspicious at first, but I found some great reviews on a RV forum about the beads. It seems the 9r22.5 tire is a common tire size on some of the larger RV models. One member talked about finding a direct supplier for the beads and says they work great on his RV. I'll share the source here in the hope it's helpful to others too:
Tire balancing beads from the sourceThanks again!
David