1. Dickinson's Witch Hazel Astringent Cleaner - A shower in a bottle
2. Interstate Authority Exit Guide -- An exit-by-exit guide to all services within a half-mile of the interchange, priceless when deciding where the next stop will be
3. Clean socks -- You'd be surprised how much your feet will thank you
4. Bottled water -- Mine comes from my well
5. Tools to battle the unexpected -- First aid kit, jack, spare, etc.
6. Cell phone -- The single greatest safety device available
7. CB radio -- Great for information and late night conversation or just eavesdropping to stay awake
8. Music - Mix tapes or CDs are best, as they keep your attention. On many trips I've passed time not by watch or miles but by how many mix tapes I've heard. Some folks like books-on-tape (the founder also drags boats across the country!). You never want to be at the mercy of local programming at 4 a.m. on a Sunday in West Texas...
9. A heavy-duty atlas -- I use a truckers' atlas: every page is laminated so it's durable, and you can write on it and erase it later. It also has information on low-overhead bridges, which can be a problem with our trailer
10. A good co-driver (See below)
11. A blanket and pillow for when you're off-duty.
12. Some sort of book about traveling or the area through which you'll pass -- If you're interested in traveling around the country, I highly recommend "Blue Highways" by WIlliam Least-Heat Moon. It's the story of his trip around the circumference of the country in an old van. He stayed off the interstate, on the smaller highways marked in blue on maps. And then read the similarly thick "Prairyearth," his sequel, if you will, about a single county in Kansas. And, no, I've never read "On the Road" by Kerouac.