This weekend when i was backing the trailer into the driveway i noticed a big shutter in the car. It happens only when i am turning and when I looked at the tire while doing this the whole thing was shaking. The ball joints were just replaced in the front along with a new tire. It only happens when I am turning and it has only happened in reverse with the trailer on. Any ideas of what it could be and what price I am looking at to fix this?