GreenBall and Maxxis are the best trailer tires in the business in my opinion. They are all we put on trailers since 2002. I have never had one fail while I have had tons of Goodyear Marathons and Carlisle Trailer tires fail in the first year or two.
Last set of Carlisle's I had were on a tri axle trailer and 4 of the 7 tires failed in the first year of ownership. One was the spare that had never touched the ground.
Last set of Goodyear Marathons I had were for my car hauler. Lost 2 on a 60 mile trip in the first year pulling a Corvette. What, maybe 4,500# total with the trailer on a 7k trailer???? I torque my lugs and check tire pressure before each trip so thats not a issue.
Both trailers were replaced with Greenballs. The tri-axle has 6 years on them and about 20,000 miles. The car hauler has about 3 years and maybe 8,000 miles.
Buy them, just make sure you are getting Radial Tires, not Bias and make them balance them. Many will say you do not need to balance trailer tires but I make them balance them.
Chris