Our Coach a Revolution, the door viberates at speed, the top 1/3.
The reason is the design. The hinge stop where the door takes an angle.
You can watch it and hear it sometimes. Eventually it will wear out the door gasket, which can be replaced. I hope the glass does not come out. Haven't heard of any losing it though.I don't know what they have done or haven't since our 05 model was produced. None of the other models follow that design and are probably reinforced inside the door. The wind goes by and sucks it out as it tries to suck adjacent areas too.
Perhapssome aero tabs or something might stop the airplane wing effect.