Tire Life

I've had a blowout. Don't try to be lucky! And I was starting year 6. The shredding tire took out an exhaust pipe, some side insulation, and ripped the rubber fuel hose. Didn't find that one out for a month or so before the next trip and a gas fill. Luckily it was an inside rear tire. If it had been a front tire, it could have been ugly.

Most Tire Mfg. recommend replacing them when 7-8 years from mfg. Michelin recommends at max. of 9 years. You can take a chance and go longer if you feel lucky, but if you blow a tire the damage will be considerably more expensive than the total costs if had replaced them before one blew. So do you feel Lucky?

For sure sun exposure kills them fast. I keep mine clean, lubricated and covered. Hopefully they will last a while.

Carrying weight, sun exposure.

We got over 11 years on our GY 670s. Tire pressure was maintained, and tires inspected at least every 6 months, just on the outside, as needless removing and remounting is not good for any tire. The tire guy looked at the date codes and said "wow, these are over 11 years old". Told him what I had been doing, and when he removed them, he said if it were not for the date code, you would think they were only 2-3 years old. But I was getting nervous.

Most MH tires, when they are used, are hauling the maximum amount of weight that they are rated for the entire time they are on the road.
Some people can get 10 years out of their tires and others, through lack of proper maintenance, get much less.