Check the listing for details. Top Rear Tail Fairing - White - For Semi-Trucks by Aerotech Caps. Condition: New. Listed at 395.00 USD. Developed by pilots using the same principals used in designing airplane wings, our aerodynamic rear tail fairings attach to the top at the rear of your semi-truck trailer and directs air to move more smoothly around the back of the trailer, significantly reducing the vacuum pocket allowing your trailer pull with less power.4% increased MPG when installed on the rear top and both sides of trailer (see side fairings in separate listing)Aerodynamic design reduces vacuum pocket allowing trailer to pull with less powerManufactured using UV stabilized fiberglass reinforced composite for extreme durabilityIncludes hardware and top mounting bracket for easy installation without special tools in about an hourKit includes pre-assembled rear top fairing with installation hardware and bracket. Designed and manufactured by Aerotech Caps in Zeeland, MI.