I have a problem. My 2001 Ford Focus Wagon (which now has 275,000 miles on it) is going through back tires in less than 15,000 miles. They are only wearing on the most inner tread that is closest to the brake drums. When you stand behind the car, the bottom of the back tires are out a lot farther than the tops of the back tires. I've checked out the rear suspension (as well as I can), and the only parts that seem to have some play in it is the bushings in the lower arms (front). Any suggestions as to how I can repair this myself? I really do not want to take it into a shop and drop a small fortune into this car at this time. Thanks!!!