I've had a couple of those tires go south on me, none were overloaded, none were out of date. I'd never put another ST tire on a trailer ever, I'd go with a used LT tire half worn out first. Just my two cents worth.........Mike
Seen that if the tire is on the right side of the trailer. The side that drops off the pavement onto the rough shoulder. I was told one time it is the rough edges of the pavement that damages the tire when it make the transition from the shoulder back to the pavement.