Extang Solid Fold 2.0 Toolbox Tonneau Cover - 20-26 Silv/Sierra 1500/20-26 HD 8' w/o Cargo Management System Model 84655Extang Solid Fold 2. 0 Toolbox Tonneau Cover 20 26 Silv Sierra 1500 20 26 HD 8' w o Cargo Management System Model 84655 The Solid Fold 2. 0 Toolbox Tonneau by Extang provides the best in weather and UV protection while sill allowing for instant cargo access. It is designed for full size trucks with 6 1 2 and 8 bed lengths and will match up the most 18 20 in standard toolboxes. The Solid Fold 2. 0 Toolbox Tonneau comes equipped with a mountain rail