I replaced the fresh water tank in our Sovereign
a couple of months ago. It was not hard, but the tank is big and bulky. It will only come out from the bottom, you need to unhook the sensor wires, and water fill, drain, and vent hoses. Then unbolt the angle iron from the front of the water tank support area, and slide the plywood base out from under the tank. I had a friend help by holding the tank up while I slid the plywood. After it comes out, just stick the new tank in place, and slide the plywood back in place.