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About SmartWay®

The U.S. Environmental Protection Agency's SmartWay® Transport Partnership was launched in 2004 and is a voluntary program between the U.S. government and the freight transportation industry to reduce the industry’s fuel consumption and greenhouse gas emissions.

The SmartWay® Technology program develops test protocols and verifies the performance of vehicles, technologies and equipment that have the potential to reduce greenhouse gases and other air pollutants from freight transport operations. The program establishes credible performance criteria and reviews test data to ensure that vehicles, equipment and technologies certified or verified by the program will help fleets improve their fuel efficiency and reduce emissions.




TrailerTail® Can Make Your Fleet SmartWay® Certified

Original Equipment Manufacturer (OEM) tractors and trailers can obtain "SmartWay® Certified" status, while vehicle components, such as aerodynamic devices, can qualify for listing as "U.S. EPA Verified Technologies", sometimes referred to as SmartWay® approved technologies. Verification requires that components be tested in accordance with a modified version of SAE J1321 test protocol.

Aerodynamic devices that qualify as U.S. EPA Verified Technologies are divided into categories based on the part of the trailer they address and the extent of their third party tested fuel savings. The two categories that feature the highest estimated fuel savings, of at least 5%, are advanced trailer skirts and advanced trailer end fairings.

STEMCO TrailerTail® 4×4 and Trident meet the advanced trailer end fairings criteria for a minimum of 5% fuel savings and the STEMCO EcoSkirt® meets the advanced trailer skirts qualifications with greater than 5% fuel savings.

For more detailed information about SmartWay, please visit the SmartWay® website, or contact us at

TrailerTail® and EcoSkirt® Fully Comply with CARB Regulations

The California Air Resources Board (CARB) has adopted the Heavy-Duty Vehicle Greenhouse Gas Emission Reduction Regulation to improve the fuel efficiency of the heavy-duty tractor and 53 foot trailer combination through the implementation of tractor and trailer aerodynamics and low rolling-resistance tires.


STEMCO provides trucking fleets with technology solutions to meet or exceed the trailer aerodynamic requirements of the CARB regulations at a profit. For fleets that own both trucks and trailers, STEMCO aerodynamic equipment investments typically have a 6-24 month payback period and a 50-200% annual return. For fleets owning trailers but utilizing owner-operated trucks, equipment payback is realized through shared savings models and improved driver retention and recruitment.




TrailerTail® and EcoSkirt® are each recognized by CARB as stand-alone devices which comply with the regulation’s requirements for trailer aerodynamics, based on their verification under the U.S. Environmental Protection Agency’s SmartWay® Transport Partnership.

TrailerTail® technology is the only stand-alone rear-drag aerodynamics technology in the industry which fully complies with CARB aerodynamics regulations given its SmartWay verified 5.54% fuel savings at 65 mph for TrailerTail® 4×4 and 5.09% at 65 mph for Trident.




Optimizing trailer aerodynamics has become a critical cost and competitive advantage for fleets pulling trailers over 25,000 miles per year at highway speed. Fleets operating AeroTrailers™ (trailers equipped with TrailerTails® and trailer skirts) burn 8-12% less fuel than traditional trailers, adding approximately 6 cents more profit per mile to a trucking company’s bottom line.

To learn more about how STEMCO aerodynamic devices can help you to meet and exceed CARB aerodynamic requirements, please contact us at

For more detailed information on the CARB regulations, please visit the Regulation website.