These jobs suck but will keep food on your plate. Since the guy isn't sure what he wants just charge him by the hour at least to start, and tell him nobody pays to wax trucks since 1960, we have sealants now. Talk him into sealing twice a year it will be easier on you. DO IT IN APRIL, TRUCKS ARE A BEAR TO CLEAN IN SUMMER AND IF YOU ARE A DETAILER BY TRADE THIS IS WHEN YOU GET OTHER WORK TOO. If you charge by the hour you can get him to buy the equipment if he doesn't already have it. Also have him purchase the sealant in 5 gallon jugs. Tell him this will keep the price down. This way if you don't like it, you wont be out the scratch, fleet brushes wont do you any good on passenger vehicles. Try to convince him to keep the washing materials on site! Say they're to bulky to carry around or whatever works. I did a company of ice cream trucks, it's a little silly to charge by the foot for washing, no offense. It isn't that much extra work from small truck to big truck believe it or not. You just have a long soft self sudsing brush and bust it out quick. Nobody is going to pay you a lot of money to wash his damn fleet. If your ridiculous in your charging, he will just go hire a laborer and put him on the payroll. Nobody pays 40 an hour, 250 a truck, to wash a truck once a week, lol. Trust me, I was a truck driver before I was a detailer. Main thing is to negotiate with the guy and justify yourself. The guy isn't looking for perfection hes looking for price, trucks get dirty very quickly. No reason for him to pay out money to wash a truck that is dirty the next day. Should only take about half an hour to an hour per truck. Wash, rinse, squegee, NEXT. I tell you the truth, I would never do this again. No money in it and it's a pain. If your detailing business isn't big enough to support you think about a second job. Try it out but don't be afraid to walk away after you find out how much work for piddly pay your getting. Remember, you are your best asset, think about self preservation. One thing, you will get employees interested in your work if you network, it could led to them bringing you their personal cars, just make it known fleet details are nothing like personal car details. Good luck buddy, sorry if I'm a little negative but been there done that. Washing the vehicle is the worst part of detailing, and that's what fleet management is, a glorified wash boy.