I was looking at the back of my truck tonight, and I noticed that it was sitting funny. Upon further inspection, I found that the tires are wearing very unevenly. The outside of both rear tires are worn noticeably more than the inside. (1/8th to 1/4 inch of difference) I am now wondering what the cause of this might be. As far as I know, you can't really align the rear axle, so is there somewhere I should be looking in the suspension for wear?