Hi Patsy,
Great to hear from you both. We were the same, no instructions, and so its all been trial and error except for a couple we met from Waipara who kindly gave us a copy of their basic English version. If you find differences on you van it would be good to post them as there seems to be differences between vans as to their functions.
I understand the getting out at night as we both sleep upstairs and it would be nice to have more room, but we can resort to your idea now when it becomes a problem.
Now regarding the fridge. Ours is a 3 way although we mainly use it on 12v when travelling and on gas when parked. You are correct, there is a separate relay usually located under the sink that picks up whenever the ignition is on that allows the fridge to chill when in the 12v position. You can tell if it is working on 12v outside in the rear of the fridge compartment as the exhaust chimney gets warm when operating.
Since I've had the solar I wired an over-ride switch in that allows it to remain on the 12v even with the ignition off if needed.
By leaving it on the 12v position, we stock the fridge up and it will be cold on around 2.5 after a couple of hours of driving I find, and so this saves a bit of gas bringing it down to temperature.
The gas and 12v works well and we can freeze anything in the freezer compartment after an hour or so while travelling or on gas. The fridge on 12v uses a bit of battery cooling down so I've found we only use it when travelling or with good solar sunlight when parked.
Regards
Bob