101,750 miles. In past year, I've had 4 alighments & now all 4 tires are almost balled on outside edge of each tire(rotations done w/oil changes) rest of tires look great. Shocks seem fine, ride smooth, & got 70000+ on original rated tires. Before I buy 4 new tires, what should I have done to fix alignment issues? Have 115,000 now.