kangoos are cheap.ive got a 350L in mine.plenty for a sole trader domestic window cleaner if your flow controller is working!!
i do trad some ground floors during my working day as well though.
check the payload if your thinking of getting one.mines 625kg.i reckon im just under with trad stuff and me.all work within 10 miles.most 5 miles so not a problem.
im well established and clean over 300 accounts every month.