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Actually you may have already pinpointed what part of the problem may be. Too much air in the tires, especially in a short bed pickup. If you run empty, meaning not hauling any heavy load then even as much as 30 pounds may be too much. Roll the rig on some dirt and look at the pattern left by the rear tire. If you can't see the edge tread pattern left in the dirt then its got too much air and will wear out the center of the tire prematurely. It will also tend to skip sideways over expansion joints in the road. Tire types and different brands will also have some effect on this. It still a good idea to look at the bushings like you already plan on doing.
Bill
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