In exact same position Dennis - I have garage in block nearby but I don't think it helps - Am thinking that it requires a system in the van (probably a trolley for me) and a friend who might have an outside tap -
Also wondered if having di only, means an instant fill up. Though more expensive process than ro, it might be best way in the short term. It would allow for a more rapid 'stop and fill'. Am very keen on advice on this too