I use three boxes
http://www.carlgoldbergproducts.com/...-Mini-Tote.jpg is fairly small and light. It can carry the stuff that is required to fuel and start the plane.
The big heavy box http://www.amazon.com/Plano-Molding-...026&sr=1-8 stays in the truck and has spare parts, hardware, and tools.
The third (similar to http://www.amazon.com/Plano-781-Plas...330&sr=1-2) has spare props, 12 volt battery, and a field charger