You have to plan what you do, no 2 streets are alike.
I have one estate where I park at spot where without having to move the van I can cover 8 houses on one side of the street ( I only do 4 of them, but could comfortable cover 8 possible 9 houses, and these aren't tiny council houses either, you'll be surprised just how far 100m of hose will go) and on the other side of the street there are yet again a similar number of houses, even though on this side I only do three of them.
And that is all without moving the van once.
Oh, and I've never had any problems with vehicles driving over the hose either.
But you have to plan out what you are doing.
Were it a council style estate, where there are 9 houses in the estate I do, there could easily be 12 that I could reach.
But once parked I'll walk to the furthest one and start at the window at the greatest distance away.
It does take some figuring out, but can be done.
If you were using a trolley system for instance, as you drive down the road, drop off a few water containers, then as you work up or down the street you don't have to keep traipsing all the way back to the van to top up.
You could also do something similar with a back pack too, in fact, done that way a back pack could be very efficient indeed....and very quick!
A back pack can have big advantages over other systems when parking is a nightmare, or you are doing rows of terraces where access is also difficult for the rear of the houses.
you can drop off water containers where you know you will need a top up, go park up your vehicle, grab back pack and poles and off you go, hell, you could cover an awful lot of an estate in such a manner if you wanted too.
It's all about forward planning.
Ian