If you're doing it just for fun then I can see it.
However if you're trying to be productive I think two wands operating will be more beneficial to you than having more suck.
We used to do a facility where we were using extended lengths, 300-400 foot runs and we had 6-units running. It was a real pain just due to the setup and tear down, truly and awful mess. The cleaning was cleaning, no problem but the effort needed to get going was and breakdown after 10 hours of cleaning was not a job I looked forward to.