A slide-in unit option from Best Enterprises can hold up to 160 gallons of freshwater and 300 gallons of waste. Its primary and secondary are stainless steel. Tanks are constructed out of 304 stainless steel No. 4 finish, which maintains pleasing aesthetics and doesn’t rust. No. 4 stainless hose hangers are used, which helps prevent the suction and water hose from hanging up. A dump sump is built into the tank to eliminate buildup of debris and keep the bottom of the tank clean. 800/288-2378; www.bestenterprises.net.