If you drive a 2022-2026 Nissan Frontier with a 6'1" bed, the BAKFlip MX4 (Gen 3) Hard Folding Tonneau Cover 448539 is a cover to look at. It folds forward against the cab for full bed access, then closes and locks to protect what you carry.
As a Gen 3 BAKFlip MX4, this cover raises the load rating to 400 lb and improves the seals and latching.
A cover on the Frontier locks the bed's contents out of sight and keeps weather off them while still opening up for bigger loads.
Textured matte black, flush to the rails. The finish carries across every component, and the cover sits flush with the bed rails, so it looks right whether it is open or closed.
Auto-latch security. The patented auto-latch engages the moment you close the cover, so there is no separate locking step to forget. Re-engineered latching panels and lock components improve forced-entry resistance compared with the previous generation.
Edge-to-edge sealing. New EPDM perimeter seals and tight-fitting clamps reduce seepage at the bed rails, the dual-action tailgate seal is 13% longer on most applications, and built-in water drainage moves moisture out of the way.
Fold it up and haul. The cover folds forward and upright against the cab, with prop rod clips holding it in place and rubber bumpers protecting the cab. You can drive with it folded open, and the third brake light is not blocked in any position.
Tougher than the original. BAK rebuilt the MX4 panels in layered aluminum with a high-density polymer core, a 22% strength increase over the first-generation cover. Aluminum rails and a stiff frame support up to 400 lb of evenly distributed cargo on top.
For a folding cover that locks itself, seals tight and fits flush, the BAK 448539 is a strong choice. It is assembled in the USA, backed by a five-year limited warranty, and available from Track Ready Products.
The Gen 3 click-in mounting makes this a one-person job, typically 30 minutes or less, with no cutting, trimming or drilling on most trucks. Clamps and hardware are included.
Clean the bed rail caps first so the seals sit on a clean surface, set the cover in place, and tighten the clamps evenly from side to side. Work the cover open and closed once before you load the bed.
Recheck the clamps after about a week, wash with mild automotive soap and water, and clear off snow and ice before opening. Keep the cover secured at all points whenever you drive.
