Are you traveling long distances with your water truck to fill up someplace? Are you filling up at a hydrant or valve that takes more than 10 or 15 minutes to fill your water truck? If that's the case, consider renting or purchasing an overhead tank. A big tank can have an 8,000 to 12,000 gallon capacity and load a truck in a matter of 2 to 3 minutes. Find out more about water truck use and safety.