I don't have the ARB, but here is my temp mounting solution. I used bungee cords and the floor hooks and seat mounts. For the power I ran 8ga. from my 2nd battery to the rear 12v socket.
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The bungee cord will not do it. You need ratchet straps or turnbuckles, etc.
bungee will let the fridge fly and could really mess up your day if passengers aren't wearing helmets
