T-regg Canyonlands easy/intermediate
If you can type all those other big words, why can't you type "Touareg" or not ad letters to it's truncation?
1. Easily searched on this site. Whatever is on your Touareg will be fine for many of the easy or moderate routes. No sense in getting an "offroad" tire for a 6000 mile highway trip with a few easy outings but if you do, there are a number of popular choices that are also very good on the highway such as the Nitto Terra Grappler, BFG AT, Toyo AT, and others.
2. Not really any skid plates available. Just be careful. Even if there were you don't "need" them.
3a. A cell phone is the last item to think of because the other items are required, the cell is simply a convenience, not a savior. First is to bring your wits, then a shovel, a spare tire, and then a way to jack the car even if not on the best surface (at least a plywood base, or similar for oem jack)
3b. Really, fuel concerns? You have a 500-600 mile range. Don't forget your brain and you won't run out. This is not Africa.

More important would be to top off your urea fluid depending on where you are on it's cycle.
4. Again, very easy to "search" on this forum.
5. I'm sure by then someone will be interested in meeting you but there are other places to find such people, not Touaregs, but overlanding folks in general. See: expedition portal to learn a lot about such endeavors. See expedition exchange to jog your mind on what you might be missing. They have everything you could possibly need.
Good luck.