I'm guessing your 10R are maybe 7.75"? For 8.25", 8.25 is usually the minimum (but check the tire manufacturers spec).
I realize 10R is rather rare, but personally I wouldn't spend the money for new wheels unless you have replace tires often. And if you do, you might ask "why" and solve that problem rather than buying new wheels. I think you are talking around $200 each for that size painted wheel and half again that for alloy or stainless.
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC