There's an ongoing thread about the Endurance tires here:
Endurance Tire Thread.
My main criticism toward the Endurance tires is lack of mileage. People who have them seem to be happy with 3-4 years and around 25,000 miles. Not enough life IMO, I expect my tires to last longer than that.
I have no idea what the cost of the tires are, and if you're planning on selling it would be a consideration. And if you're selling the trailer the life of the tires would be moot.
People who have them seem to be happy with them, and they are definitely holding up better, with few, if any, problems normally associated with ST tires in general.