[Sdiver]

Some great things so far. As TR pointed out, getting a paper road map(s) would be essential. I keep an atlas handy at all times. I don't trust that electronic crap. Just give my a map, a compass and my nose and I'll get ya where ya need to go.

One thing I'm surprised I haven't seen listed, is a set of jumper cables. Always useful to have handy, even if you don't live in a part of the country that gets exceedingly cold.

Now, here's the BIG question .... what can you reach while sitting in the front seat?

You and your vehicle are off the road and buried by the brush.
You are trapped inside. The dash has trapped one or both of your legs, making movement limited to just reaching, and slight twisting.
You can't be seen from the road, and only from the air if someone is directly over you.
Can you reach water, food, first aid?
How about a blanket or clothing to keep you warm?

It's great having things in your truck bed, I know I do, but I also have at least a gallon of water stashed behind the passenger seat, next to my first aid bag, that has a wool blanket attached to it.
I have several power bars and bags of pistachios stashed in the door pockets of both the drivers and passenger doors, which I can easily reach.

I also have a bag of jolly rancher candies in the glove box, and another smaller bag and gum in the center arm rest/storage area. I also have a lighter, knife, flashlights, leathermen, binos, penlight flares, signaling mirror, pens/paper, extra batteries and various other tools located in there.

Like with having your weapon easily accessible, what ever is in reach to keep you going if you were to find yourself in the above situation, will be the difference between reading about a great survival story or your obituary.