Extang Solid Fold Toolbox 2.0 Hard Folding Tonneau Cover for 2015-2020 Ford F-150 (6'7" Bed)

Here's the short version. Follow Extang's install sheet (below) for your truck's exact clamp and bracket hardware. Your crossover toolbox goes in first; it is sold separately.

1. Wash the bed and set the L-channel. Wash the truck bed. Stand the L-channel against the toolbox, its foam seal sitting under the L-channel's lower edge on the bed floor, and center it between the bed walls.
2. Place the cover. Rest the assembled cover's front rail on top of the L-channel, centered against the toolbox. Unfold it fully and set it for the right cab and tailgate position, then refold it without letting it shift.
3. Clear the flange. If a bed cap or bedliner covers the metal bed-wall flange, trim only enough of its edge for every clamp to bite on the bottom of the metal flange.
4. Clamp the front. Hook each front clamp under the bed-wall flange and hand-tighten until it touches, then two more turns. Not on the lip of a bedliner or rail cap, and no wrench. Trucks with a factory cargo management rail get a clamp plate at the cab clamps (on most, the tailgate clamps hook straight into the rail), as the sheet's supplement shows.
5. Close it and set the rear clamps. With the tailgate open and the front clamps tight, fold the cover out flat. Slide each rear clamp out to the bed wall, pull it down and hook it under the bottom edge of the flange.
6. Driving with it folded. Release the rear clamps and stow them securely in the rail before you fold the second section, fold the cover forward toward the toolbox and fasten both straps to the front rail. Clear snow and debris before folding, and never drive with it partly open.