You could say why put your machine next to the tap tho, you have to push your machine miles away to the tap, up steps, down steps, round corners.
Swings and roundabouts me thinks. I just run from the side door of the van straight from the water tank. If you put signs up most people are fine with that and just cross the road or walk round your van, the majority of people who have common sense realise people have to have work done and sometimes that means taking up part of the pavement for a few hours.