I would suggest to take a fridge and an esky if needed, 2 large eskies while going camping for 12 months would be a nightmare for me. Thats only my opinion and others may differ by the way, it would be nice if you could keep us updated on your travels.
It all depends on how far and long you stay away from any shops/civilisation you will be staying as well. I found that died veges, potato and vacuum sealed meat kept us alive when we went up to the cape. Vacuum sealing worked really well we were still eating the same meat we took with us when we got back over 30 days later.