You won't get anywhere without risk. Take someone on full-time with a contract, train them up then let them go out alone to do most of your work.
There is big risk in this, so the reward will be big also.
Then think about putting a deposit on another van for you.
Then you'll wonder why you didn't do this before. That's what I thought.
I now have two guys on £9.00ph in the same van, and I've got my own van. I work once a week at the moment and spend my other time doing admin / advertising work to build the business up.
If it doesn't work out, try again.