I will only chime in, in response to OP in this thread. After reading about the buffeting on here, I have rented 4 16-18 yukons/tahoes, one being a yukon xl and I never heard a thing in any of them. When buying my 19, nerves were up, and would've sworn I felt the pressure and the swinging feeling in my head when we went for the test drive. I psyched myself up so much while signing the papers, I was sick. Even leaving the dealership,
@goodinblack gave me a call and I still could feel something. After my nerves settled and I drove it more, the feeling went away and I haven't experienced it since. One thing I will note, the tires and terrible flat spots when I test drove and probably 20 miles after leaving the dealer.