I ran my Towmax tires for 5000 miles before the first one blew,
It damaged the body work, fender skirt, and rim. Repair estimate = $1000
I decided to replace all the tires. One of them I pulled off showed signs of separation and could have blown any time.
Even the good tires showed uneven wear - as though they had been under inflated. FWIW, I was very careful about keeping the tires inflated to 80 pounds.
My trailer traveled at ~14,000 pounds. The hitch weight was ~2500 pounds. Weight on the tires was 11,500 pounds. The tires had a 3500 pound rating, so I was well under limit (11,500/4 = 2875).
My conclusion was that there was a quality issue with the tires. They would not carry the weight that was listed on the sidewalls.
I switched to Hancock LT7.50x16 tires. They cost ~$190 online. The rating on these tires is #3300, they are load range G, they hold 105 pounds of air. I also added a tire pressure monitoring system. After almost 10,000 miles since the change, I am starting to feel a little more relaxed while driving.
Here are some things I have learned.
I heard a pop when my tire blew, but I never felt a change in the way my rig was driving (I saw pieces flying off in the mirror - noticed the drivers behind me slowing down)
The air supports the weight, the tire hold the air.
LT tires are rated more conservatively than ST tires to allow for driving forces (when used that way).
LT tires are trailer rated.
ST tires actually have thinner sidewalls than LT tires.
From the tire pressure monitoring system, I have learned that the tire pressure varies greatly by temperature.
All tires should receive a pre-trip inspection for uneven tread wear, buldges, cracks, etc. While you are looking at the tires, check the springs and spring hangers too.