I have a 16 foot dual axle trailer pulled by a chevy 2500 with a 2 in drop hitch. I usually carry two zero turn back to back or one zero turn in middle of the trailer. Everything seems to be pretty level cosidering the weight disturbution on the trailer. Why do my back trailer tires wear so much worse than the front ones? It might even be 2 or 3 times faster tire wear. Any solutions?