It is the electric controlled shut off valve for the tank. Because of the in-accessible location of the tank (as far as manually closing a normal shut off valve) the electric one was required to meet safety requirements.
You can reduce the electrical load considerably by installing magnets on the valve. If you have not, join the View/Navion forum on Yahoo, as Len on there can tell you exactly how to do this.
That valve is controlled thru the propane detector also, but I think you have a switch either at the fill point or inside or both also. I am not familiar with the setup of the new Views. Mine is an old one with a manual valve.
Charles
'03 Ram 2500 CTD, 5.9HO six speed, PacBrake Exh Brake, std cab, long bed, Leer top and 2008 Bigfoot 25B21RB.. previously (both gone) 2008 Thor/Dutchman Freedom Spirit 180 & 2007 Winnebago View 23H Motorhome.