Extang 2021 Chevy/GMC Silverado/Sierra (6 ft 9 in) 2500HD/3500HD Trifecta ALXThe easiest truck bed cover just got easier. The Trifecta ALX packs the same great features as Extang?? s best selling tri fold cover, the Trifecta 2. 0, but with a Secure Rotary Release Latching System at the tailgate and an automatic latching feature that?? ll make getting the goods in and out of your truck bed that much faster. Installation Instructions Installation Instructions This Part Fits: Year Make Model Submodel 2020 2026 Chevrolet Silverado