I upgraded our original 14" 6 PR tires two weeks ago to 8 PR. They were just over one yr. old with about 3,500 miles. No wear or appearance problems, I just wanted to do what I could, within reason, to help prevent a disaster on the road. I believe any blowout(not leak) while traveling, is possible to cause more damage to the trailer than the set(all five) of better tires cost me. Plus, considering the lose of time and trouble of repair at a time like that, to me it was a no brainer. The 8 PR tires can carry more weight safely at 65#, compared to the original tires at 50#. ......Yes, any tire can blow at any time, even a new one, but I'm satisfied I've done about the best I can to prevent that from happening.