Security is not a problem, Because if I want to close the van doors,I close them over the microbore hose and lock them when I have reeled out to my furthest point.It does not effect the flow rate.I only lock my doors when its very windy.
The ducato has big soft rubber seals around the doors so theirs plenty of room for the hose.
I dont clean windows at 60 feet,I have a 35' pole and the flow rate is the same at that level as it is at ground floor.
Neil