The 300/150 slide-in unit from Crescent Tank Mfg. is designed to offer a low center of gravity. It includes a 300-gallon steel waste tank and 150-gallon poly freshwater tank, Conde vacuum pump, Honda engine, 25-foot vacuum hose with wand, 1 1/2-inch water fast fill inlet and a 12-volt water pump with 50-foot water hose on a retractable reel. It will fit best in a 1-ton pickup or flatbed truck. Other vacuum tank sizes are available. 585/657-4104; www.crescent-tank.com.