I carry a shotgun in the trunk of my car for anything situation that may pop up while traveling some of the rural areas of southern Arizona. For those that don't know, it isn't exactly safe. I am a little leery of keeping the shottie in the trunk in case someone breaks into my car and steals it. I am thinking about building a shallow false wall behind the back seats out of plywood and carpet to match the car's interior carpet. If it is done right, it would appear like the back of the seats and I doubt someone doing a quick "smash and grab" would thoroughly check for the false wall. So my question here is has anyone done anything like this? Made a hidden compartment in a vehicle to hide a firearm or other valuables?