You've got a good list! Just comments on specific items as they occur to me --
- Sunglasses -- They saved my eyes once, serving as safety glasses.
- Maps and/or GPSr -- I'm a believer in paper maps in addition to a GPS. Sometimes electronics fail.
- Toilet paper & alcohol hand sanitizer -- I pack a whole sanitation kit for two.
- Wool blankets or sleeping bag -- Is there a reason you specify wool blankets? I've got fleece.
- Ranger bands (cut up inner tube used like a HD rubber band) -- Hey, this is the first I heard of ranger bands. I looked them up, and while it looks like you can buy them, I'm guessing your solution is cheaper. Is there a kind of inner tube I ought to look for?
- Mechanical traction aid or cat litter/sand -- I have cat litter right now, but some people say cat litter can break down into fine clay, making the situation worse. I tried sand bags, but they can get wet and freeze.