What happened to you reminds me of a near-tragedy in our family years ago. I had leased a brand new Dodge Ram pickup 4x4 for our daughter to drive to college. She had been attending classes for a few weeks when she drove to her boyfriends' parents' home to visit. While there her boyfriend's Dad (who is a mechanic) noticed the front wheels were sitting at an "odd" angle so out of curiosity her crawled under the front end and discovered a couple of large bolts holding the front tires in place were barely still threaded in place. He immediately repaired the problem and called me to let me know what could have happened. I checked with the Dodge dealer where I leased the truck and he said it "must have been a factory error during manufacturing the vehicle." I took the truck in and they inspected the now tightened bolts and pronounced everything OK. I told him they were very lucky the wheels didn't come off while my daughter was driving or they would have been far from OK!