I started with a tackle box, but then it got full and I didn't have room for all cells, power supply, fuel, etc. etc. etc.
Now I use a Stanley rolling tool box. Everything fits except tire truer, radio, fuel and car. Fuel (and fuel acces.) go in a silver metal box, truer only comes with me if I feel like it, and radio has its own box. All stack on the tool box and rolls quite well
RC10L2.5W - RC12.4 - RCNTC3(bmi) - TC4 (modded) - B44.2 - plus rent-a-rides! :D