no one has ever suggested it (dealers and mechanics that I have taken the car to)? what does it do?

 

I have the same problem and it just started after I rotated my tires, never before that. I have Yoko Avid V4's all around and for the first 7500 miles they were fine. I got them rotated and my car seems to shake driving from 35+ but does go away at higher speeds. I don't notice anything when braking so that is a good sign. I feel sometimes that when it shakes and I am turning that for a second I don't have control of the Max and that does worry me. I am going to take it back to Goodyear who did the rotation and ask them to take a look at it. I hear others talking about the road force balance, what is that?