trail king tires

I bought a set of Trailer King (ST225/75R15) from a local tire shop for a TT I used primarily for hunting. I put about 5000 miles on them, and much of it on dirt/gravel forestry roads. I sold that TT to a friend who uses it for the same thing and under similar conditions. The same tires are still on it and he has not had any problems that I am aware of.