The factory had to come get my unit and take it back to Elkhart for repairs. :-( Since it has come back the I get minimal to no water in unit. Pump seems to be working so I suspect maybe a hose broke when it was up there in winter. But I cannot find any documentation as to where the fresh water tank is or if it is accessible. In my old Sunseeker I could lift the mattress in master and see the tank. Found a great storage area I didn't know I had when I tried that on the Forester.
Look for the tank drain line underneath. It should be the one that DOESNT have a cap in it (that would be a low point drain). Follow that straight up. What are you looking for about the tank?