I agree the vibration can be from the tires sitting. After a few hundred miles of regular driving that should go away (based on my experience)I'm going to dig up an old thread because there's lots of great info in this one related to my question.
I picked up a used '07. Brand new tires on it. I never noticed it in the test drive but I rode in the back esterday and I could feel a vibration in the back. Taking a walk around the car paying a little more attention to it, I can visibly eyeball large amount of toe in on the rear. The passenger side more so then the driver side, which gives me some circumstantial evidence of why I may be feeling vibration I think is coming from the rear passenger side.
I see some of you mention zeroing the toe. I know usually a tiny bit of toe in is good to keep the bearings loaded properly. What number are you guys shooting for with respect to toe in? I'd rather go into the shop and tell them "Give me xxx toe in on the rear" instead of taking in there and having them tell me "Your toe in is within specs"
As for toe, the inside wear on the tires would be casue by toe out or negative toe. This kind of setting will scrub your tires pretty good and fast.
I don;t recall the rear specs, but I would guess you'd want between 15' and 30' (quarter to a half degree).