FlowBelow Aero has introduced its redesigned Trailer AeroSlider System, an aerodynamic solution that the company says saves 3 gallons of fuel per 1,000 miles traveled. The company introduced the system at the American Trucking Associations’ Management Conference & Exhibition this week in Charlotte, North Carolina.
The launch comes as owner-operators and carriers contend with near record-high diesel prices. The national average on-highway diesel price was $6.28 per gallon this week, according to the U.S. Energy Information Administration, after reaching a record $6.53 on Sept. 21. At $6.18/gal. (the weekly average during the week ending Oct. 12 when the system was introduced), the AeroSlider delivers approximately $18.54 in fuel savings for every 1,000 miles a trailer travels.
The Trailer AeroSlider targets one of the most aerodynamically complex areas of a tractor-trailer: the exposed wheels, suspension, and underbody surrounding the trailer tandem. The system combines FlowBelow trailer wheel covers, flow-through mud flaps and optimized rear fairings.
Rather than simply shielding components from airflow, the rear fairings direct air leaving the tandem slightly outward and rearward, diluting the trailer wake and reducing turbulence around the wheels and suspension.
Because the system mounts to and travels with the sliding suspension, it continues to deliver fuel savings as drivers reposition the tandem for different loads and axle-weight requirements.
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FlowBelow first introduced the AeroSlider in 2017. The newly redesigned system improves on fuel savings with a single fairing over the previous design, achieved with separate center and rear fairings.
The result is a smaller, more durable package that costs less, installs faster and fits virtually any make or model of dry van or reefer trailer, FlowBelow said.
The complete system weighs less than 30 pounds and can be installed on existing trailers in less than 45 minutes. Once installed, it requires no driver involvement.FlowBelow
FlowBelow optimized the system through computational fluid dynamics (CFD) modeling, wind-tunnel testing and track testing.
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In June 2026, MVT Solutions conducted independent fuel economy testing using 2019 International LT tractors pulling loaded 53-foot dry van trailers. The baseline test configuration included side skirts and trailer wheel covers. Adding the AeroSlider’s rear fairings and flow-through mud flaps saved 1.77 gallons of fuel per 1,000 miles compared to baseline.
In separate testing, MVT Solutions verified fuel savings of 1.23 gallons per 1,000 miles from FlowBelow trailer wheel covers. Combined, these iimprovements represent total potential fuel savings of 3.0 gallons per 1,000 miles.
“Our goal with the AeroSlider was to develop an aerodynamic system that could pay for itself in less than 18 months for a typical regional or long-haul fleet at $3.00 per gallon diesel,” said Josh Butler, president and chief technology officer of FlowBelow. “At today’s fuel prices, payback can be less than 12 months, even for fleets whose trailers travel as little as 30,000 miles per year.”
Butler added that the company believes the AeroSlider “has the potential to become the next practical step fleets can take to reduce trailer drag without adding meaningful weight, maintenance, or driver involvement,” after trailer side skirts, which have seen widespread adoption.
The Trailer AeroSlider is available directly from FlowBelow for retrofit installation and can be spec’d on new trailers through participating trailer manufacturers.
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