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I use two 25lt containers, there is a stainless steel tube in each one and they are connected with a Y piece. water always finds it's own level, both containers empty at the same rate.I sometime just change one container leaving a few inches of water in the other one, they will still be empty at the same time.You will be able to connect as many containers as you like.
I have 300l in bottles, but the van is only 1149 cc so I couldn't put a large capacity tank in it.