I agree that you dont need to have a full van install from a company in order to be a wfp window cleaner.
However sometimes I wish I did, just for the relative ease of a quick fill up when im parked up. For now I rely on the 450gpd RO filling up the Ibc tank and then when I'm ready I can fill my van tank in less than five minute. Obviously I can upgrade the Ro for a 4040 system if I chose to do so.
My van system is a DIY from pure freedom but when I open my van doors, it looks tidy, presentable and professional for the task at hand.
Im pleased with my diy electric reel (purefreedom reel) and my microbore hose that I connect my rhino red pole hose to inorder for me to use my slx pole n brush. I dont think I would feel the same pulling out a cheap plastic hose reel with a standard garden hose connected to it and I would be in a hurry to shut the van doors so no one saw.
Theres cheap and theres cheap! But cheap doesnt mean it cant better organised