We always turn our gas cylinders off when on the move.
The reason; many years ago in our boating days, there was a small cruiser on the River Thames, which had a small gas fridge in the cockpit, which was on. The boat was driven by a petrol outboard engine,which had stopped because it ran out of fuel. The owner started to refuel the outboard with petrol and there was an explosion.
Our point is that if the gas fridge is on in the motorhome and one visits a garage to refuel, especially in this hot weather, the petrol vapours could be ignited by the pilot flame of the fridge.
We are also fortunate to have an auto changeover of energy supply selection for our fridge, so turning the gas off whilst on the move simply switches the supply to 12v automatically.