So...I thought it over and had a good deep sleep tonight.
Our decision now is to keep the car cause we will have lots of opportunities we wouldn't have with a 2wd campervan. Even if it uses a bit more petrol than we'd prefer and even if there are some rusty spots it is still better than a damn campervan half as old with nearly the same mileage that has only been owned by backpackers, is fully rotten and will probably break down if we are more than 200kms away from a town.
I even thought about investing a bit into the car and get an auxiliary tank or even a bigger main tank - though the prices are really high on those, we'll see.
I have looked up the book on the internet and found "Centre on a Budget" by Sheedy here
http://bit.ly/sxX4zM and "Outback on a Budget" here
http://bit.ly/vDMHny...get both?!?!?!