back packs are a great tool... a few months back , my van didn't fill, as the hose hadnt connected to ro...
so I put 8 barrels , back pack and pole in my picasso, and went off for a few hours whilst my van was filling ... I did about 10 houses £120..... then went back at mid day by which time my van had a bit more water...
its not ideal, and I prefer vanmount ... but it's viable to work out of a car with barrels.