The left rear tire, faceing the 5vr from the rear, is wearing evenly on the inside from about the center of the tire to the inner edge.The tire is a Tacoma Trail AWT M&S LT 235/85R16. I always hold the pressure at 80lbs. The rest of the tires are fine. I have a little over 11,000 miles on the tires. I think this could be a balance issue, or that my 04 Mountaineer has a rear galley and this tire is close to the weight of the frig. Any idea?