There are both good and bad points on having either 1 man or 2 man van set-ups, personally I prefer a 2 man set up.
There are a lot of benefits for a start on large commercial 2 men are faster than one, on domestic although they will not be able to do twice as much work as a one man van, the costs saved from only using one van instead of two and the extra amount they can do is just the same as having two vans on the road.
The other thing is sick and holidays, you need to plan for both of these, on a two man set up if one is off at least the other can carry on, with a one man set up, when he is off that van is not earning.
With regard to the customers and them getting only to know the cleaner who turns up, well I always call the night before, so I am always meeting all my customers every month, even though I don't clean their properties.
and as for the cleaner doing odd jobs on the side or taking my customers and starting up on his own, well the first is easy, the van is set-up with a gps tracking device, I know where its been and for how long.
and on the second point I have a water tight employment contract in place and if they do take on any of my customers within the first year of leaving my company and I can sue them for the lost income, so thats what I will do, I will wait 50 weeks and then take them to court and get the past 50 weeks of work they have done and been paid for, paid to me.
Of course getting the right cleaner and paying well should stop this.