One of the selling points for the heated underbelly is that we could take it camping when the weather was cold and the heat ducting when using the furnace would keep the tanks and water lines warm down there. Also, the underbelly protects the underside from gravel etc that can pop up under there when driving. The downside for us is you can't readily see what's going on under the tt, and have to trust everything was installed correctly and completely.
Dream of future camping adventures! Will you be taking your first "trip" in 'Camp Driveway'???