Airtabs are unique, Vortex Generators (VG) that have been specially designed for 30-90 degree angled rear of vehicles, such as trucks, RV's, Trailers, Toy Haulers, SUV's and cars. They work by creating a controlled swirl of air, or vortex which actually reduces wind resistance (or aerodynamic drag). Aerodynamic drag has long been a target for fuel economy on vehicles.
Airtabs Dramatically reduce the 'fish tailing' on trailers and have made tremendous impact on the handling of double trailers in Australia and North America.
The Airtab® shape has been tested by and they concluded that the device had the lowest parasitic drag of any similar vortex generator. Although will not officially endorse any commercial product, the device is currently being used to reduce turbulence behind the test strut in the wind tunnel at Langley VA.