The ATDynamics TrailerTail Roll, or RollTail, is designed specifically for trucking fleets that operate trailers with roll doors rather than swing doors. Each TrailerTail Roll will improve tractor-trailer fuel economy by 4-5 percent at highway speeds by streamlining the airflow at the tail end of the trailer. In addition to fuel savings, the TrailerTail Roll will increase vehicle safety by reducing spray in wet weather and decreasing trailer instability in high winds. The patent pending design requires zero driver interaction and can be installed by two people in 45 minutes. The TrailerTail Roll retracts automatically along the sides and top of the trailer when a trailer is backed into a loading bay and deploys automatically as the vehicle pulls away.