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During my recent trip about the only thing that drove me to distraction was my Esky and the need to buy ice every day. It will never happen again!
I have bought a 50 litre compressor fridge/freezer for my ute. It works off 12/24volts and 240volts I still have to get and fit a deep cycle auxiliary battery but that won't take too long.
It even comes with its own insulated jacket. No more warm beer ever again! I doubt I will ever use it as a freezer but the option is there.