I strongly second Zenslo's suggestions. He has extensive Unimog camping experience. There's an easy way to figure gas consumption of a stove. Gas (propane or butane) is about 20,000 btu/lb or 44,000 btu/kg. A gas stove burner uses 4500 btu/hr (small burner) to 7000 btu/hr (large burner). So figure at least 1/4 lb per hr. For your hot water and space heater you would need to know your insulation factor (including windows, size and ambient temperature and how much hot water you use - much more complicated calculation. But believe me: if you just have a gas stove 15 kg of gas will last you 4-6 months, but if you heat space and hot water it will use up FAST! Get an Eberspacher or Webasto and microwave and an inverter. We have been camping a total of 3 months running in our Unimog and there is still lots of gas left in the first of two 30 lb cylinders.
And don't forget to take an extra unmounted spare tire on your roof that I suggested on your other posting. Tire disasters can happen, and 335/80R20s aren't everywhere, and it's no fun travelling sans spare tire.
Charlie
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Unimog U500 w/Unicat
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