its a 2005 xc70 with 50,000 miles. had an alignment done and a balance. It feels like the car has a mind of its own and wanders, always needs a little adjustment to get it straight. When trucks or buses pass by feels like its getting pushed to the side. Went to dealer said everything was ok. Is this...

I just purchased a 2005 xc 70 with 36,000 mile on it. It is in great working order except the steering wheel has a slight vibration in it and the passenger seat vibrates at 65mph and over. Ihad new wheels put on, an alignment and balance. Got a little better but it is still there. The mechanic said ...