If you look at the speed rating on trailer tires theyhave a maxium speed of 65 mph. Extended time at that speed or over causes them to come apart even if the pressure is maintianed. I switched all of our trailers over to 16" 7.50R16LT tires.
https://www.amazon.com/dp/B00MWZ4TBW/?tag=joeychgo-20
Havent had a blowout on one since.