But useful at times Aus-Kiwi e.g. when running on gas. Ours pulls down in about 3-4 hours & works in all climates (we live in the tropics).
And as we used to travel in our Eagle, you can use them as a big esky with a few frozen water bottles in the fridge, the freezer compartment full of frozen food. We could go from Tnsv to Rocky (700 kms) & not have any problems with milk, etc still cold & the freezer was still frozen. That was a 90L 3way.
silverperch, you'll have to work out the size you have available, what you want to carry, for how long & how you'll access the contents (top or front door). A 12v fridge will require a good deep cycle battery & something to charge it with if nor using your vehicle.
Perhaps some of the WA members can help with where to buy.
Good luck!
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Warren
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If you don't get it done today, there's always tomorrow!