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also the thule boxes with the quick grip fixings have a slot in the box which allows about four inches of movement

I tend to try and fit mine so that the wind flow up the slope of the screen hits the front slope of the box to minimize the aerodynamic disruption, you do see with some of the long narrow boxes that the front of the box is out over the top of the screen so the wind flow up the screen will hit the bottom of the box creating lift and drag