I have a custom built vault that I had in my Toyota Tacoma. It has a sliding compartment in the back for gear and one in front for other stuff. It has always had dog crates on top of it and has otherwise supported all the gear two hunters needed, icluding cases of shells, for 2 week hunting trip. It is well built.

It is black and acts as a false floor. I've actually been checked by gendarmes who never even noticed it.

I also have a integrated dog box vault that fits a SUV from a RAV4 on up.

Let me know if you'd like to purchase either one or need more info. I can send pick and dimensions.