Let's remember that we use our tires in very different ways.
1) Some have light loads so they have extra capacity on the tires and axles while others run close to the max.
2) Some drive at lower speeds than others. Please note that some tires are rated at 75 mph, some at 65 mph and some at 55 mph. Over driving your tires will increase the potential for failure.
3) Some drive predominately in cooler weather. Driving through the western states during the summer can really apply a heat load to your tires. Heat is an enemy to a tire.
4) Some have their coaches stored indoors where the tires are less subject to temperature extremes, UV rays and potentially to less ozone (dependent upon the area of the country it is stored). All of these factors deteriorate a tire. So indoor storage away from a major metropolitan area is better on the tires.
5) Frequency of usage will vary. Under optimal conditions, your coach should be taken out for a good run of at least 20 miles every 2-4 weeks. That will maintain the drive train and the tires in their best condition. The chemicals in the tire that help protect it against ozone and UV deteriorate. Driving the coach will cause the chemicals in the rubber to move to the outside of the tire again to better protect it.
6) Most of us NEVER wear out a tire due to mileage. The race car team coaches may, but the rest of us typically find that the tires are deteriorated due to age when they still have most of their original tread. When I purchased my coach, the tires had most of their tread but were cracked badly and were 13 years old. They truly were 'Unsafe at any Speed'. They even had massive cracks in the tread grooves. The dealer drove it only as far as the truck tire shop to have them replaced.
7) Some tires have been replaced with the incorrect Load Rating in the past. Always use a tire with a Load Rating as high or higher than what the manufacturer originally specified. I have seen early 90 model Newells with G rated tires. Not good. They came with H rated tires and should always be replaced with H or higher rated tires.
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