Originally Posted by WoodenPlank
Agreed on all counts.
Full stock, empty chamber is the way to go. I would say hammer down and safety on, so it's run pump, hit safety and ready to go.
Also, most carjackings/parking lot robberies are at VERY close range from what I understand, and a shotgun is going to be pretty unwieldy. If you can't CCW, then I'd suggest a handgun in a secured location in the vehicle.
I agree on both his and your input too. I want to add that I really think it is important to carry a good pocket knife at all times. Something small like a Spyderco Delica (just an example). Maybe you already thought of it or it's already covered but I'm amazed sometimes with people who CC "sometimes" but never carry a blade.