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Extang 17-21 Ford Super Duty Short Bed (6 3/4ft) Trifecta e-Series spo-disabled pressurized ram-air into the engineThe Trifecta E Series is a soft folding truck bed cover topped with a durable vinyl material. Its lightweight aluminum frame and Extang engineered heavy duty support bows span the width of the truck bed for added durability. For ease of use and to keep tension to the truck bed, the Trifecta E Series is engineered with intuitive, spring loaded tailgate clamps. Drive with the Trifecta E Series in either the closed or the fully open position. Like all