How do you know when the fresh water tank is full? We come from Forest River products and they have a vent hose underneath that water comes out when the tank is full so I thought water would come out the little vent hole by the hose connection but nothing. I see water leaking from under the camper as we go down the road and the fresh water gauge is reading full. I started to pull the underbelly off so I could see what was going on and it looks like there are 2 fresh water tanks. Is that right?? Are the vent hoses for both tanks tied together??? I don't think I should have water leaking under the camper unless the tank vents are not connected properly.