I just got an F150 crew cab... there is a bit of a space behind the back seat, which looks like a good place to put a rifle, pistol or other items I might want to store in the vehicle while traveling cross country. Anyone have one, and can tell me how I can get access to it? (Way to pull the seat-back, forward? I could shove a pistol case back there, but it would not be secured to anything... Thanks!