I have found that some freeways are very hard on tires. The I-5 in the northern portion of Calif. is bad. It is concrete and the adjoining sections have settled in some of it causing a jolting "thump, thump" as you drive along. Broke the cords in a Toyota truck we had once and had to put the spare on. When we got home, we found the cords were damaged in the other tires so we ended up replacing them all. Then we learned that Toyota allegedly was putting on el-cheapo version tires (Michelin IIRC) while tire shops were selling the "good" ones. On another trip, we lost TWO tires on the I-5 in Norcal.
I wonder if it would be prudent to slow down on freeways/highways like this when pulling a camper?
I also have to wonder how long it takes for tires sitting out in the sun to get damaged by UV rays? I have my car trailer sitting outside exposed to the elements. One year, a tire exploded while it was just sitting out in the yard. Perhaps tire covers would be a good idea when the RV is not in use?
The tires that came on our trailer are rated for max. 50 psi. We have a smaller trailer though. Sure wouldn't want to travel with these ones over 50 psi. I think our dealer said to keep them at 35.
Gil & Deb & Dougal the Springer Spaniel