You may laugh at this one but I have everything in my car trailer in labeled Rubbermaid plastic boxes. Tools, electrical, carb parts, cleaning supplies, and I have one box labeled "lucky box". In that box I keep a very nice supply of nuts, bolts, washers, spacers, shims, wire lumes, butt connectors, and any other odd ball part I throw in there. People laugh when they borrow something out of it but it usually saves their racing day. The only part that gets old is instead of building their own lucky box they count to much on me having it for them and then I re-buy the stuff to restock it.