What happened to the duct tape, electrical tape, pliers, vice grips, screwdrivers (slot and phillips), a cresent wrench, some wire, jumper cables, wire, flares, can of tire inflate, a few water bottles, tow rope, you know those emergency repair and help items? I have a bag in each car with all those items included so we can make any emergency repairs while on the road.
Yes, I agree with the rest like flashlight, etc., but don't rule out something to get you home like a small emergency repair.
BTW, I like the camera idea and will take that in to consideration in the immediate future.