I think trailer manufacturers put the cheapest tire and the closest to the load rating tire they can on their trailers. I think most of the failures are the 16" tires on fifth wheels. There is not enough reserve to allow for occasional overspeed or occasional under inflation. In my case I went from load range E (3500 lbs load) to load range F (3950 lbs load) and had 2 failures at just over 3 years. People said change them at 3-5 years and mine failed at the lower end. I chose to go 17.5" tires and rims so I can check the tires not the calender.
Brian
