We had a weak spring. It manifest itself by wearing the tread off on the inside of the opposite tire--at least, that is what happened to us. It could be a load problem, so check that first. When you are satisfied with the load, measure the distances between the center of the eyes for each spring. Make sure that you have a level spot and that you have pulled it straight for a bit. If there is a weak spring, the measurements should tell you--one distance will be longer. We had all the springs replaced with heavier duty ones and everything seem fine although we are about three inches taller.
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