I picked-up a medium size tackle-box, and stocked it with things like electrical connections, wire wraps, elec tape, pipe tape, WD-40, lube-oil, dry graphite lock-ease, soulderless connectors, spare fuses, various plumbing fittings, asorted nails, screws, nutts,bolts, washers, spare parts, a small 110/12 volt multi-meter, water hose gaskets, spare hose nozzle, blow-out fittings for interizing, spare annode for water heater, tiny wire brush for cleaning elec connectors for trailer, etc...
I then pick-up a rechargable screw-gun that I use for screw/nutdriver/drill bits and or a socket for raising and lowering my stabilizers. To go along with that, I picked-up a single kit in a durable plastic molded kit, that had the assortment of bits that I was looking for. Also got a spare batery. One battery in charger (mounted in storage compartment) , one in gun, sio that I always have a charged battery. My screwgun came in a kit with the gun, a charger, a battery, and a flashlight (which uses the same battery). I kept the flashlight as a spare in an inside drawer for easy access.
The other major item in my tool-kit is a Kobalt (Lowes) tool-kit - about 130 pieces, all secured in a very durable molded plastic case. Great quality tools, this kit, or similar, is usually available before Christmas for less than $100.00. Stay away from the simlar "junk" tol kits, for $30-$40 (or less!). These tools aren't dependable when you need them the most! (Been there, done that, got the tee-shirt!)
2014 RAM 2500 Laramie 4x4 Quad Cab w/Cummins Turbo Diesel, 2009 Rockwood 2607, and 3 'yaks!
300W of Suntech Solar, a Rogue MPT-3024 Controller, and a Xantrex PW2000 Inverter