That's gas altogether!!

Ceist agam oraibh (a question for ye)...which is the safer option and what is legal when it comes to turning off the gas internally under the sink or going outside every time? It's more convenient inside of course but is it legal to turn off inside and leave bottle open outside while driving or must I do both to be sure to be sure? 1000 thanks...Míle Buíochas

A lot of vans are fitted with a slam shut ( crash valve) mounted in the gas locker, in a crash it will turn off the gas,
It can be switched on and off from inside the hab door,
The idea being that you can have the hab heating on while driving.
If you want to turn off the gass, do so at the bottle's the valves under the sink are mainly isolation valves for servicing the appliances, or an appliance fault so you can disconnect it but still use other gas appliance. If you use them while driving, you still have a live gas feed from the bottles going into the van. (think crash) It is not recommended to drive with a fridge operating on gas, as the wind from driving can effect the flue gasses and soot up the pipe.
When going on the boat, you are informed to turn off the bottles, and have to hang a card in the window to show you have it done.

For handiness, ,ve fitted a 12v solenoid on the low pressure side of the regulator. Switch off/on from the main switch panel. I never have gas on whilst driving. However I can have habitation heating on since my heating id diesel powered.

Force of habit, I always turn the gas off at the tank when driving.

The connection between the gas bottle and the regulator