The Crescent Tank vacuum tank is flat inside and out. It has no baffles, allowing it to be emptied completely to avoid internal corrosion, according to the manufacturer. With the included pump at specified cubic feet per minute, unnecessary fatigue of the structure is eliminated and the life of the tank is prolonged. It is made from 1/4-inch steel for structural strength. The workstation is designed for the portable restroom industry. The liftgate rail width allows units to fit, and multiple liftgate deck and rail options are available. It carries up to 10 portable restrooms based on the model, and the weight capacity is the same as a flatbed truck, the maker says. Freshwater is held inside the external 1/2-inch-thick poly tank to avoid wastewater contamination. 585-657-4104; www.crescenttank.com.