First thing we needed to do with our new RV was to get new shoes on her. The Michelins were over 12 years old and badly cracked on the outsides, no telling how bad the insides were. Many tire manufacturers say that RV tires should be replaced after 7 years under ideal conditions (kept clean, not exposed to the sun for long periods, etc…). I have seen a 10 year replacement recommendation on occasion, just keep in mind the older they get the more likely they are to blow out or have a tread separate...