Each rack has an overhang section that cantilevers out over the truck’s cab. We specifically build our overhang lengths for Standard Cab, Extended Cab and Crew Cab applications at a distance set out over the windshield to allow wind to travel up off the windshield and release through the rack. If / when an overhang is recessed above the roofline of the truck’s cab, the wind will roll off the windshield and hit the front bar, deflecting down to the roof and causing wind noise. This can come in the form of a light wind, a hum or even a massive howl depending on how far the overhang sits back on the cab. Typically, this wind noise is exaggerated at freeway speeds.