If it's a well made van with a fridge properly installed you are correct. I know of at least 6 vans where the there is a breeze from around the fridge when it is windy. It is common for fridges not to be installed properly and not just on cheap models...Assuming someone introduced a flammable gas into the living quarters of a MH, then the gas should not be able to reach the flame of the fridge.
Because if the gas could reach the flame, then looking at it the other way round, the products of combustion from the flame would be able to get into the living quarters, which they should not.
( apparently ) the most commonly used ( sic ! ) gas is NOS ( Nitrous Oxide ) and that is not flammable ..In fact it will put out flames as they are deprived of oxygen
NOS not flammable? I thought is was quite explosive hence using it in cars to make em go faster. Guessing high temp and pressure required then? Learn something new every day.