Kiawah, thanks. This does help. I am not sold on the car sitting on the same spot overnight only because this subtle shaking happens when I am doing errands all day long or even after 5 hour drives. Always 50-60mph. So annoying. I can feel it in the steering, so it must be front end related? I will try the balancing, but think that it is the wheels. Thank for the input though this helps very much.