I'm currently on a 4000 mile plus cross country trip pulling my 33 ft rv, so I have a lot of time to think while driving. I was wondering if one of the contributing factors to trailer tire failures (beside the crappy chicom tires we have to buy today) could be the fact that our race trailers and rv trailers spend a most of their time parked, causing the tires to develope flat spots. I know during the Cold War the Air Force would rotate the tires on their B-52 and tanker aircraft while setting on extended alert duty to keep the tires from developing at spots.