My wife drives the MKC to work. We had a bit of snow and she ran through a big drift to avoid traffic, vehicle handled it quite nicely. On the way home she felt a vibration when she went over 30mph. I noticed quite a build up of ice and snow on the backside of the wheels, knocked off as much as I could, drove the vehicle and it seemed okay. I actually felt a big clump fall off when I was driving. She drove to work this morning and reported everything back to normal. Anybody else seen this, build up of ice and snow resulting in obvious vibration? We drive in snow a lot so this may turn out to be a PIA if it is common.