Carpet Genie, I got a purefreedom system just over a year ago I had the filters, ro etc all in the van, since moving house i have since taken it all out of the van and built a static system which is so much better for me, if i only need to top up its there, i can fill to where i want instead of carrying a full load every day, theres always water ready if i ever need anymore which has never happened yet, a 650 ltr tank will deffinatly be enough for now with 300 custys a month as thats roughly what a one man band does in a month so obviously your going to probs at least double in size and when this happens there maybe a time where you need to top up tank in van so static will be best bet if you have the space,
do you know your pressure from mains my old house was 30psi which took about 10 hours to fill my 650 tank, my pressure in new house is 70 psi which takes about 4.5 hours to fill tank.
Chris