I have been running 14 " bias ply Carlisle trailer tires on my dual axle 6.5'x14' trailer. I am only getting about 4000 miles max from a set of tires. The wear is uniform across the tire, and they are balanced. Does anyone else have the same problem, or a better solution? I am considering going with a less expensive radial passenger car tire. My total weight with trailer is probably never over 3000lb. Any comments and suggestions would be appreciated.