2015 Chevrolet Tahoe body & structure problems

The liftgate malfunction is both bizarre and dangerous. When opened it proceeds to drop about a foot quickly, enough to create serious head contact. It then proceeds to close without use of sensors, repeatedly pinning the operator against the back of the car. Only with strength and agility did my wife manage to slide out the side. We are thankful that the only damage was a bruise on her leg. It could have been much worse for an older, less agile person. It happens when vehicle is stationary, on or off.

Bad vibration at speeds between 60 to 75 MPH ( GM dealer has had car 3 times and replaced tires, road forced balanced, checked alignment with no success ) ; wind noise and buffeting inside car with all windows in the up position at speeds from 35 MPH and up causing dizziness and nausea on longer rides. Exterior door plastic fascia becomes loose and falls off due to metal clip breaking off at the attachment point.