just put new shoes on the baby.... All six tires! Since we've had our rig, the tires seemed ok, tread still well pronounced. After deciphering their true age I decided to replace the rears..then the fronts too. I looked into switching to the 16 inch rims, but I didn't see a cost benefit. Peace of mind perhaps that when on the road if needed your tire size can be found with ease. But now knowing that Firestone still makes a 8.75R16.5 for RVs and can be usually ordered in a day's notice most anywhere, I stayed with the 16.5. You've all heard the rumor...bigger is better lol!!
Just so you know, Firestone...a well trusted brand. Cost $1143. Out the door.