For those of you that have hunting, camping, or vacation rigs (truck, SUV, etc.) how do you store extra fuel? Maybe on a trailer, roof rack, or receiver hitch platform?

What cans are you using? I know the CARB-compliant cans suck. They can (hypothetically, of course- wouldn't want to condone any illegal activity) be modified to not spill gas all over the place, what with not having a vent hole and the silly spouts they have.

So, say you wanted to store ten gallons or more on your car, securely? That is, you want to make it a little difficult for light fingers to abscond with your cans, knowing that nothing is truly burglar-proof.

Thanks.