Anyone have an idea of why my wheels are vibrating at 50mph - 60 mph? They have the right amount of air in each. I just rotated them but didn't wait too long to do them. I rotate every oil change. This starting happening after my recent rotation. Could it be unbalanced wear?

 

The cars are very susceptible to vibration, particularly in that range. Tire balance is crucial. There are also motor mount issues. There is a link to service bulletins somewhere on this site that explains both issues.