Just a little 3kg bottle for my camp stove. been carting it around inside the car for years but that activity has always scared me, especially now that I've got a fridge compressor switching off and on in the car too. It's up on the roof rack now where it can breath if it needs to.
This happened to a mate of mine when a spark from a fridge thermostat set off a leaky gas bottle

He was very lucky in the end, and it only took us a couple of hours to put his ute back together. Can laugh about it now and I still bag him about it