I suspect that the size of the fridge deemed to be necessary is in some way mathematically related to the size you have or the size you want. It's a bit like that old saying about jobs expanding to take up all the time available to complete them.
I did a trip to Darwin about a quarter of a century ago with a borrowed 15 litre Engel. With my wife and two kids, we never found ourselves wishing we had a bigger fridge.
About ten years ago I did a trip to Broome via Oodnadatta, the Tanami and the Gibb River Road. Once again the 15 litre Engel was plenty big enough. It even held the fillets from the 720cm barramundi I caught at Katherine.
I have been told by others that a small efficient fridge/freezer like an Engel or Danfoss based model can be used to supply quite a large icebox with ice. A 20 litre cooler would be useless. A 20 litre freezer is quite a different proposition.
I know this rather rambling reply doesn't really answer your question, but that is partly because at about the time I was going to have to face the same decision you now have to make, I bought a second hand camper which was already fitted with an 80 litre 3 way Electrolux. It performs quite satisfactorily.
I guess the point I was trying to make is that if you accept that you have a certain size fridge, sometimes it's amazing how well you can manage. So sometimes other factors like how you are going to fit the fridge in the vehicle and whether you are going to need to lift it when it is full become important factors.


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..............so long as its an Engel
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