CLASSIC U-SHAPE DESIGN FOR MAXIMUM CARGO CAPACITY. Flip it out with the tailgate open to gain up to 2-feet of enclosed cargo area. Flip it inside and close the tailgate to keep tools and smaller cargo contained in the truck bed. BEDXTENDER HD MAX-GM/CO Flip it out with the tailgate open to gain up to 2-feet of enclosed cargo area. Flip it inside and close the tailgate to keep tools and smaller cargo contained in the truck bed. Classic u-shape design provides maximum cargo capacity. 2015-2021 Chevrolet Colorado Fleetside; 2015-2021 GMC Canyon Fleetside