Are you talking about for a mobile setup? RO has a limited flow rate, and also has a fair amount of "waste" for membrane flush that you probably can't afford with a limited mobile supply.
Yes I Am Mobil..100 Gallons Of Reserve Water, I Do Not Know The Better Way To Go R/o...d/i..the Di Is More Up Front But I Think Is Is More Economical To Maintain,,
If you are talking about one of the systems that go under the sink in the kitchen I would suggest not even thinking about using it. I have one set up under my sink,it has a 4 gallon reserve take and when new and after every filter and membrane change it takes about 8 to 10 hours to fill that tank. It would be very slow to fill that 100 gallon tank which would not allow a fast fill for the next day. Plus the income water needs to be under pressure since there is not pump to push the water into the filter media. I hope this helped.