Agree 100% the Wavian NATO cans are probably the safest way to transport fuel in a portable container. Ideally I carrying extra fuel is something done with any regularity, installing a larger main fuel tank or an aux tank is the best way to go, although definatly not most inexepensive (around 2k just for the tank on my JK), although if you factor in buying the cans, mounts, and perhaps a swing out carrier the cost gets a bit more palatable. Plus having the tank located between the frame rails protects it during a collision, keeps the weight way down low, and is just a lot more convenient. Have a long range america tank planned for the JK build. My next best place is to carry NATO cans in a rack on the rear, high enough that during a rear end collision, most passenger vehicles will pass below the level of the cans. Have the parts to build a swing out carrier for our WJ to get the spare out of the back and carry a couple of wavian's just need to get around to welding it up..lol Will never carry cans in the passenger compartment of a vehicle, beside the almost inevitable fumes, a ruptured can during an accident or roll over can be a disaster. (Responded to a rear end collision while in the fire department where the driver was bringing home a couple of cans of gas for his lawnmower, one can ruptured and sprayed fuel throughout the vehicle interior, fortuantly no fire occured).