I bought the Bakbox when I bought the MX4 cover thinking I was going to fill it up coming from a Ram 1500 with RamBoxes. Turns out, after getting rid of the junk that I never used, I have more than enough space for the few things I need handy under the rear seat. So I am putting this up for sale. I still have the original shipping box and install instructions. https://bakflip.com/bakbox-2.html Asking $250. I will pay for shipping.
It could be mounted closer to the tailgate as easily. It mounts in the track so anywhere should work. I tightened it down so it does not move but I suppose you could keep it a bit looser and allow it to track forward and back. It is very quick and easy to install and remove as well.