Ellen's list is almost exactly  what I keep stocked.  Plus, coffee and two
canned meals, like beef stew or Chili or a fuerte soup of some kind.  I also
keep a small bag of doggie treats, sport drink mixes and some spare
batteries.  One of my best recent camping tool  discoveries is the LED
headlamp!  I have three, one for the van  & one for each occupant.  I have
to fight to keep the van one inside as it often ends up on  my shop bench or
in my S.O.s horse trailer...
  Before winter comes again, I plan on building or finding an appropriate
container for tire chains (to go in the rear left corner of the engine bay).
Another camping improvement is going to be two spotlights mounted on the
A-pillars.  Had some on my splitty and they were very useful checking out
primitive camp spots after dark, as aux. driving lights, for lighting up
anything in camp, etc.  I'll wire those into the extra battery, just in case
of dumbness..
  Don Hanson