Equal or weights is what I've used. I prefer Equal.
I have 22.5s on my current and last MH. I've bought new Michelin's 3 times and have never been told not to balance them. Monoco, the original one, and Prevost deliver their product with balanced tires. New Prevosts comes from the factory with Centramatics. I would think a slightly out of balance rear tire on a heavy coach may not be felt. I would bet it would be felt on the front. The Michelin instructions previously posted are to prevent out of round not out of balance. Personally, I would balance any tire running at highway speeds. It doesn't cost much.
99 Country Coach
Prevost XL 45 Conversion