The only difference in the local use and the on-road use should be the amount of plastic and chemical you carry. I can go for a week with an extra roll of plastic and a 5 gallon bucket of chemical. Don't forget an overnight bag. If you want to go on the cheap, sleep in the van and use truck stops to shower in. My van, a one ton step van, is set up for all of the services we offer, except fire alarms, and works just fine. Sometimes I have to step on/over pipe and fire extinguishers, but it works. The gas mileage on my one ton is only 6 or 7 MPG, while the 3/4 ton ford gets 12 or 13.
Douglas Hicks
General Fire Equipment Co of Eastern Oregon,Inc