This Poly 100 Gallon Water Tank is ideal for the mobile detailer working out of a pick-up truck, van or a trailer. These 100 plastic gallon water tanks are the most popular size for mobile detailers, giving them enough water to last the day and then some! Depending on how conservative you are, you can wash (full exterior wash, wheels, wheel wells, bed liners, etc.) 10 to 15 car on average. The average mobile detailer performs anywhere from two to six full details daily. Additionally, this water tank also includes with it molded slots for tie down straps so that this unit is secure and safe at all times.