If you lease a van to do expediting work it will cost you a fortune paying for all the extra miles you put on it above 12000 miles a year. Your best bet would be to by a van then set it up to your satisfaction, and put all the miles you want on it.
If I were you I would look into all your options and do some planning. Things are a little slow right about now. Work isn't as good as it should be, and the cost of fuel is on the rise.