Yes. The black and gray tanks are strapped to the underside of the coach.
I don't know your exact layout, but if it's like mine, the freshwater tank is located under the bed. I put a piano hinge on the plywood cover that covers the tank. Under the cover is the freshwater tank, water pump, strainer and tank drain valve. So now I have a small storage area on top of the tank, right under the bed, and is used for extra sheets, blankets, paper towels, toilet paper and a small electric heater. Also under there is an accumulator for the water system so the pump runs only after about a quart of water is used, not every time the faucet is turned on.