I had a hard time finding an aluminum box that would fit the gas grill, generator, and fire bowl so I built my own. Its been used for a few trips now and works perfectly for my needs. There’s still room for two Pelican kayaks to be jammed nose first into the front of the truck box and they sit on the plywood box at the back.
Pros: cheap, simple to fabricate, custom fit for truck and storage needs, easy access, almost invisible at a casual glance, easy to install and remove for travel, and probably just as secure as an aluminum box.
Cons: takes a while to design something that will fit all the toys and fit tightly into the P/U box, not watertight (but adequate), only as secure as the tailgate lock.
1. Fabricate blocks to fit over the tie down brackets in pickup box. (note 3” holes in photo).
2. Make them thick enough to make them flush with the frame for the tailgate and add anchor plates to receive bolts from the ends of the storage box.
3. Slide storage box into position and fasten with 4 bolts.
4. Load storage box with junk you can’t part with and close tailgate.
5. Ready to travel. Access to the middle section of the P/U is fairly easy by climbing up on the tailgate and then stepping over the storage box.
To upgrade this project, consider doing it in aluminum, steel, or fiberglass over plywood. Also consider adding a good shackle point for locking up a generator.