Have a '22 BigHorn crew cab with the 60/40 rear bench that folds up for floor storage. The seat backs slide up a bit as you fold the seats up but don't detach as far as I can tell. It looks like there could potentially be lots of room behind the seat backs to mount accessories like air compressor, radio bricks, but I haven't found my way in yet. So who can tell me, what all is already back there, and how does it come apart?