Hello. I had noticed a difference between the rear drivers side tire and the other three tires on the car. The rear drivers side tire is more in on the rear fender, while the other three are the same which is lined up with the edge of the wheel well. I also have rattling noise which seems to come from the back. The question i have is what kind of problem do i have, how serious is it, also is the repair very big and how important is it to get it fixed. Either right away or can i wait. Any help would be greatly appreciated.