Some great advice there fellas thanks, i think from what you are all saying it looks like a van mounted system or a trolley version to get me going, then convert it to a van mount as and when required ie basically put a big tank in the van and use it from there or take it with me for those hard to reach places.
Just one other question is, if using a van how big a tank as some guys feel they use more than say 250 litres per day and would this need fastetning into the van properly and by who as i couldnt do that i dont think, i know carrying water canbe dangerous if not secured.
Thanks again fellas, brilliant post Spruce by the way, much appreciated.