Went out earlier with the intention of getting a few things fixed, but didn't manage to get any of them done. Still to do
Put air in the tires
Get the gas & heating working
Get covers for the windows
Gas
There's a huge red gas canister below the van on the driver side. There is some way to turn the gas on or off from that canister itself - you have to lie down on the outside of the van.
In addition to that, there are three knobs under the sink that control the flow of gas. I believe one of them is for the fridge, the other is for the hob, and the other is for the heating.