a trolley system will be ok for a while but you ll want a tank and 100m of hose after a few months.dont fill at custies taps as it looks unprofessional and wastes time.maybe it might be ok to do it occasionally with a small DI but really you should be looking at a 350L-400L tank if your a one man band.
i do trad the odd ground floor windows but mostly im around 80% WFP.once you get going trust me 9 times out of 10 its easier and faster just to pole everything!!
all of us start out with the idea of just wfpoling the tops but it quickly turns into ground floor windows for most of us!

best wishes
dazmond