Interesting thread. I picked up a new Model S 90D (19" tires) two weeks ago and had my first highway driving yesterday. Had terrible shaking in the front over 70mph on the highway. Although I know it is not the actual issue, it felt like one of the wheels periodically would be unaligned on the passenger side. This thread makes me feel like the issue is not an isolated one. Unfortunately my new Model S (this is #3 for me) has an unbelievable amount of other problems, and so the shaking is just another to add to the list (this is not even the worst problem - there seems to be a car-wide electrical problem causing all sorts of issues). Disappointing as I have literally never had any real issues with any of the Model S vehicles before (even the < 4000 VIN one only had a handle that needed to be replaced). BLAH!