Location of fresh water tank 2011 Lance 1050S

Thanks for suggestions. Batteries are under the step. Owner's manual diagram is typical setup but doesn't match mine.

Following the fill tube, which goes from outside, across the galley sink cabinet and then goes down by the water pump, the tank is apparently under the sink and behind the propane tanks. Doesn't appear to be any easy access to it. Will save the hunt for another day! Too many accessories to install on the new truck today. :)