I bought a new caravan last year - one with an onboard water tank. For the life of me I cannot see the advantage in this arrangement - unless you really want to travel around the country with a few gallons of H2O swilling around in your van for the dubious benefit of having a cuppa immediately on arrival. Have I got it right??. You transport water in the aquaroll to the van, to transfer into your onboard tank to transfer it into the sink. Have I missed something?, or is this another way of using up valuable locker space in order to play the childhood game of pouring water from one container into another. Somebody put me right!! brian.f