I'm currently using two large Rubbernaid boxes... you've seen these at places like WalMart or Target, they look like real big Tupperwares.
One of them holds my power supplies, chargers, tire truer, dischargers, basically all my support electronic items. The other holds my box of spares for the car I'm racing and the car itself, plus a body or two and my transmitter.
I keep all my tools and chemicals in a large Plano tackle box.
All three boxes fit just right on a small folding luggage hand truck I got a home depot.
This is easily the most effective hauling system i've come up with to date. No way all the stuff I bring to the track would fit in a Trinity hauler bag (or anyone else's for that matter)
Trips