If you carry it in a car, better the trunk than passenger compartment. A rapid leak from the tank could fill the car with condensing water vapor making vision difficult.
If someone had a compressed gas tank in a parked car in the daylight, that's very injudicious. Car's can get very hot and although CO2 tanks do not get filled anywhere near their tested pressure capacity, storage in parked car (even short term) is beyond the recommend proper use.
I don't know if the pressure relief on big CO2 tanks is the same, but I've had paintball tanks blow their 2000 PSI pressure relief disc from sitting in a car on an average warm day.
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