Extang Endure ALX - 21-26 F150 6'7" Model 80703Extang Endure ALX 21 26 F150 6'7" Model 80703 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 coated panels, forming a