I understand what you mean. Driving our full size truck, things dont blow around against the cab, only towards the back of the bed. But my toyota will pull anything out of the bed thats not lashed down when going fast. Maybe it has more to do with size and the aerodynamics of the vehicle. I do know it works with this truck. I dont have a degree in aerodynamics so I can only speculate on what wind laws come into effect. Im sure you can factor in cab/bed size and shape, speed and a mess of other stuff and come up with different results. I just know it works with this type of truck.
