I find if I chit can trailer tires every two years I won't have a failure. BTW the road temp was 189 degrees as I left town pulling to Vegas for a race.
Heats the big killer. Had a blow out coming back from Vegas in 2013. Tires had less than a year on them. The other 3 suffered from ply separation's ( was able to catch them before they blew ). All were well within the rated load range. I don't leave my trailer loaded, but flat spots were much more prevalent with biased ply tires - as compared to radials.
