I have an 800 litre system with a three man set up. I have 3 pumps, but one of two pumps will run both hose reels, just in case a pump goes down. The third pump runs without a controller, i plug a portable hose in to under the van, and can control the pressure via a tap on the hose. Only use it twice a year on a commercial job, comes in handy, but do get through the water fairly quick.
In the case of the odd job and you are doubled up in the van, i would just stop and clean the house together, imo, i don't see the point of stopping, unloading gear ect, may as well just do the job together.