And bear in mind that water is heavy (sounds weird when I read it back but it's true in practice). If you use sites and fill up on arrival and drain off to a degree before departure then I suppose it makes sense to not have to run to the taps all the time but be careful of how much of your payload it eats up if you roll with it.
Would it not be cheaper and more simple to buy a water carrier and submersible pump?
I see that the Explorer Group, who fit relatively tiny tanks, are now fitting pressure systems to their new vans so that a water carrier can be parked outside on site, a la caravans.
Mind you, hark who's talking - my van has a 130 litre tank, as standard, and I do tend to nearly fill it before leaving home - it does last a long time.
I did do a weight check and the loaded van, full of water, was well within the limits.
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