Thanks Roy - I'll think about that - but here's my plan, tell me what you guys think (bear in mind I am the ultimate faffer and "make do" sort of fella.) I already have an aquatec trolley system.
Small trailer - ten barrels (plus six in the car) = 250 litres on trailer = 250Kg plus leisure battery and pump and 30m hose reel and maybe trolley frame too. Total, say 300kg when full.
Connect pump through four or six-way union so I can pump out of several barrels at once. (100L)
Besides my usual marbles am I missing something?
My aim is to have all the benefits of the trolley plus tha capacity and hose length of a larger system.