I agree a van mounted hose reel does save a lot of time, and bending over!
For me having my flow conected to the pole hose, and attached to a sling that all I have to do it hang it from my neck, and clip the pole hose into microbore - enables hands free pole operation, and easy control of the flow valve.
Van organisation is key - I have all my poles mounted in a rack in the van, with hose hooks.