You only get one life JSMC and in that life not many chances. This is a genuine chance.
My circumsatnces are that I have a 400l tank in a scudo. I have a booster pump at home that feeds a roman 300gpd through a DI (a blue cylinder) into a 1000l ibc holding tank. In the holding tank is a transfer pump that can fill my van up in minutes.
This means I do not need a DI on my van and can call home part way through the day for refills. I travel light and I travel fast. My system is hot, not just figuratively, but the actual water comes out onto the windows hot.This needn't bother you but it gives me a massive competitive advantage.
Could 'dad' make use of the van in the week? Kitting it out for one day a week is probably not on.