Extang Endure ALX - 21-26 F150 5'7" (Includes Lightning) Model 80702Extang Endure ALX 21 26 F150 5'7" (Includes Lightning) Model 80702 From tireless engineering and a relentless pursuit for perfection comes a low profile bed cover designed to function like no other the Endure ALX from RealTruck. With a flush mounted design, the Endure ALX creates a seamless, polished exterior appearance when closed while delivering highly functional full bed access when open. The Endure ALX features four patented EnduraShield TPO