I have a 2007 Nissan Quest, had to replace tires @ 28000 miles because the rear tires had gone completly bald. I had the allingment checked by the dealer after new tires were instaled and they said that everything was good. A coulpe of weeks later I noticed that the new tires were begining to feather out. My wife had the dealer look at it again and they said the tow line was bent and they straightened it out. Now the tires are wearing out with only a couple thousand miles on the tires they are more than half worn out. Also there is a low vibration at about 1800 RPM. Any ideas??