Let me add some tools to the lists in the library:
1. A small, plug-in AC voltmeter to monitor CG power. Plug it in permanently in a visible outlet. If the voltage drops below 105VAC, it can damage A/C units.
2. A cheap Radio Shack multimeter.
3. A pair of 12 - 16" curved jawed Channel Lock pliers. Invaluable for tightening and losening hose couplings.
4. Two long neck barbeque lighters. One to back up the other.
5. A boxed multi-bit screwdriver kit. RVs use a lot of square drive screws as well as phillips head and slot head.
6. A 1/2" drive clicker torque wrench for checking wheel nut torque. Buy a cheap one, you will use it only occasionally -- say like the start of each trip.
7. A mini Maglite or two. They have the advantage that you can hold them in your mouth while you try to light a water heater in the dark or other such chores.
8. Spare DC light bulbs for your interior lights, your cleareance lights and your tail lights.
9. A portable weather radio.
10. Tire gauge.