Hey sounds like you are headed in the right direction with your kit.
I did not see a towrope or better yet a snatch strap (Non Hooked ends as the hooks are dangerous if they slip loose and snap back) listed in your kit. You have a capable little car but things happen and you might be able to help someone else.
I agree with the Mora knife suggestion they are by far the most knives for the money that I have found. Ragweed Forge http://www.ragweedforge.com carries a good selection and Ragner is a good guy to deal with.
A small pry bar from your local hardware store along with a hatchet (local hardware) or a machete (Ontario from Army Navy store works) is likely to take you farther than the little combo tool you mentioned. Most of your combo tools and “survival” knives are made of less than ideal steel.
All of your kits seem to be a little light on water buying bottled water will help it store in the car better. I carry a cooler during the summer and keep a gallon of water in it for drinking during the day. If I put fresh blue ice in it in the morning the water stays nice and cool all day and is very drinkable for a couple of days.
Understanding the basics of using a map and compass is a skill that should be worked on. I may have overlooked it but I did not see a compass listed on your list. Any of the little base plate compasses ($10-15) or sighting compasses ($15-up) by Nexus, Silva or Suunto should serve you well and can usually be found at outdoor stores or even Wal-Mart.
I have some of the Mainstay bars but find that food I eat on a regular basis changed out of my kits yearly do better for me.
I use to live in your part of NC (Ashville) and liked the feel of having forest and mountains close around you no matter where you were. Of course almost every year someone gets hurt or worse in those same mountains. Even though the winters there are usually moderate you get slammed every few years with a hard winter. Those hard winters are the ones to prepare for. Make it so you and your grandmother can live for a week or so with out power. Make it so you can survive in your car for a few days in that kind of cold weather. Those are the kinds of goals I aim for when setting up my house and vehicles.