On our last motorhome we bought new tires for the rear at about the 40,000 mile mark. They were supposed to be balanced using Equal Balance Beads. As time went on the ride got worse and worse. It was obvious the rear tires were out of balance.
It finally got to the point that we stopped at a tire dealer in Florida and aske to have the beads removed , and the tires rebalanced with external weights. When they dismantled the tires they found no balance beads had ever ben installed.
The tires now were starting to get flst spots. They rebalanced them with weights, with one tire needing over 12 ozs. The other 3 needed around 8 ozs. each. Even with the tires now balanced the flat spots made the ride terrible. We ended up replacing them with only 30,000 miles on them. We could have probably gotten double the mileage from them had they been balanced when new.