I had a fixed under body 160ltr tank and a 20ltr gerry can with tap, strapped above the sink in a merc van. the 160ltrs I used for washing cooking and tea/coffee, and the 20ltrs I purified with micropur powder, for drinking. I never had any problems. micropur powder is excellent, leaves no taste and a film canister size container is enough for 10,000ltrs! very economic. I believe some of the overland companies use it.
I agree that the outside tank could freeze and mine did get hot! so I would keep it inside next time.
I used a foot pump which was fine.
Graeme
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