I agree to a point Ian, but this very much depends on the men doing the work. When I work with my brother, we motivate each other to work faster and faster, we have always been competitive with each other and this makes each job almost like a race to see who can work the quickest. I know for a fact that working together we do much more than double what I would do alone. However I have another bloke who works with me now and then, and he is totally different and would rather stand and chat than get on with the work, when he is with me we definately do less than double what I would achieve alone. But I still doubt it would justify the expense of a second van.