I feel victim this summer, too! We got our '97 Coachmen Catalina just last year, and the tires did look very good. Since I had driven the old Tioga class C from Texas to New York twice in three years, the last time being after owning the RV for eight years, I didn't check the tires on the Catalina. I DID have the dealer check them as part of their safety inspection in March, and stressed to them that I was going to put 4000 miles + on it in the next month. They said I was good.
Well, 45 minutes outside Austin, 105 degrees outside, 70mph and POW! Rear inside tire commits suicide. I managed to get off the highway, onto the side road and stop. I lucked out and someone nearby knew a tire service and they got me back on the road in 30 minutes. I did take it slower the rest of the way to New York. When I got there, found Tallman Tires in Whitesboro New York, $1066 for six new shoes and I put the one new one from Texas ($225 installed) as the spare. Lot smoother ride going back, and felt safer too.
Now, I've heard people talk about using Armour All, wheel covers and keeping the RV inside. This was the inside tire that blew, so it's already out of the sun. The rubber just simply deteriorates over time. In about six years, major trips notwithstanding, I'll be putting new treads on and know I'm safe.