I have a tandem axle trailer with less than 2000 miles on it with original tires. I drove 3 hours to a tourney this weekend and 2 of the tires (one on each side) were wore almost to the thread. NOTE: All Tires had correct 50 PSI when I left home and looked new! The tire wear was not uniform on the 2 tires. I had put the spare on and purchase a new tire with mounting and balance. None of the tires on had wheel weights. The technician said the cause was tires of balance. We inspected the brakes/pads and all were good = not a brake issue. ANY IDEAS???