I had a set of marathons (USA Made) on my previous trailer and now have a set of Marathons (USA made) on my current trailer. Previous trailer went over 30,000 miles over five years and the current trailer has seen 20,000 miles over four years. So far no blow outs and no trailer damage. Will be looking for new tires after they see their fifth birthday.
I did have one blow out when the current trailer was new with China bombs on it. $800 worth of damage only 10 miles away from the selling dealer. All I got from Duro tire was $90 to buy another Duro tire.