Extang Trifecta ALX Soft Folding Tonneau Cover for 2022-2026 Toyota Tundra (5'7" Bed, with Deck Rail System)

Here's the short version. Follow Extang's install sheet (below) for your truck's exact bracket hardware and torque settings.

1. Place the cover and open the rails. Set the folded cover at the cab end, square to the bed, with its bulkhead seal on the bulkhead; unfold it so the tailgate seal touches the tailgate with its first two fins, then refold it without moving it. Take the tailgate-end caps off the cargo rails and remove any tie-downs, both sides.
2. Fit the cab clamp brackets. Slide a cab slide block into each cargo rail from the tailgate end and move it near the cab. Line the cab clamp bracket up with the cover's cab clamp and screw it to the slide block with the T-27 wrench. Hook the cab clamp under the bracket and turn the T-handle until it touches, then two more turns. No wrench.
3. Fit the tethers. Unscrew each tether knob from its slide block, slide the block into the cargo rail and thread the knob back through the washer into it, both sides. Refit any tie-downs.
4. Mount the striker brackets (Tundra and Titan). With the tailgate open and the cab clamps tight, close the cover. Take the striker bracket off its slide block, slide the block into the tailgate end of the cargo rail and refit the bracket lined up with the cover latch. Push the cover down while you hand-tighten the Torx screws; the final adjustment comes later.
5. Adjust the latches and rotary knob. Both latches and the knob leave the factory only partly tightened. Lower the rear of the cover, slide each latch until it catches its striker and lock it from underneath with the T-20 wrench. Leave 3/4"-1" of the driver-side cable through the barrel clamp, tighten the knob screws and the barrel-clamp set screws (2.5mm hex), then turn the knob to check both latches let go. Hand tools only, no power tools.
6. Make the final adjustment. Back off the striker bracket screws, pull the cover firmly down to the rail and tailgate so the brackets move down, match both sides and retighten to 3.5 ft-lb (4.7 Nm). Refit the cargo-rail end caps if needed.