A slide-in vacuum tank unit from Best Enterprises can hold up to 300 gallons of waste and 160 gallons of freshwater. 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 steel hangers are used for trouble-free spooling of hose. 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.