Self-contained slide-in tanks from Robinson Vacuum Tanks start at 300 gallons and have been built as large as 2,000 gallons. Customers can choose a stock unit for fast delivery or have a tank custom built to specifications. Units are tested and shipped completely ready to go. Customers can choose from many options that include choice of a vacuum pump, washdown pump, hoses and valves. Each has built-in forklift pockets for easy mobility. Tanks are available in both single- and two-compartment models. 844/393-1871; www.robinsontanks.com.