If you can find a tire shop for Large RV tires that uses a device called "Road Force" go there. Or you can google it.
That machine will tell if tire is out of round, where to rotate tire for tire matching, and which weights and where to place them. $32.00 per tire.
I have no connection at all with the local tire dealer who has the only one in the Las Vegas valley: Ted Weims commercial tire center on Blue Diamond Road.
I overheard a technician talking to Michelin stating "We found it out of round on our Road Force balancer and "Michelin" just said make sure to get the mileage before replacing the tire". That really impressed me.
Some of you may want to keep this place in favorites. (Added: others have said to rotate the tire, the Road Force machine tells how far to rotate)
Kerry