I assume from the question you have an absorption fridge.
12v / 240v / gas just provides the heat source that drives the process, that part of it doesn't care too much about being out of level. The problem is that the fridge needs to be level so that the cleverly designed and angled pipework containing the refridgerant works correctly. Running out of level can cause problems and I know of people who have had to 'burp' their fridge to correct it by removing it and turning it upside down for a number of hours.
Having said that, the fridge is more likely to be sensitive to your forward / aft level than your side-to-side level as the pipework tends to run across the back of the fridge, therefore fore-aft in your vehicle. So you could try parking so the vehicle is flat front to back.
My absorption fridge gave up the ghost this time last year, so I now have a 12/240v compressor fridge designed for use in yachts that can work at up to 30 degrees, so I will probably chicken out well before the fridge does.
Agree with Steve. makes no difference whether on LPG, mains or 12v ..
the liquid refrigerant depends on gravity to return to the heater, so if it's badly out of level the liquid will stop returning to the heater.. and stop working.. it can also damage it permanently if left running like this.. ..
as said, fore and aft is the most critical .. Electrolux say up to +/- 6 deg will be ok..
as a guide, at that level it would be uncomfortable to live in the van..
so, if you think it is less than 6deg try it and if it cools as normal I wouldn't be too concerned but keep an eye on it.. if it's stops working switch off ..
We level up our RV with the fridge door and the bathroom door (across the back of the RV in the middle).. if the fridge door stays in the middle I know we are level front to back and if the toilet door stays open and in the middle of it's swing, then it is level side to side.... when I drive up up the ramps I can normally feel it is level within an inch front to back.
Older fridges are more sensitive to being off level that more modern fridges.
Over a period of time the refrigerants separate when off level eventually the fridge will stop working altogether. Whatever heat is applied to the refrigerant,whether gas or electric it will slowly damage a fridge if off level. The only reason that 12 volt whilst on the move doesn't harm the refrigerants is that you are moving from one plane to another ie, up hill and down dale. Have tried taking several fridges out and tipping them on there sides and upside down, but its only a short fix,sooner rather than later they give up altogether. John your fridge is designed to run at 50 millibar as its a German import. Your regulator is 27 millibar. This will not help matters.
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