Newell supplied either the manual system you have with individual toggle switches or, as an option, the HWH automatic system in the early 1990's.
You should be able to install (or have installed) the HWH system but it will not be inexpensive. In addition to the key pad, there is a large control box (mine is in the bay behind the left front wheel) and a level sensor (located in the center of the coach in the ceiling of the bay behind the entry door). Valley Detroit messed with the inside of the control box on mine and shorted it out. They said they paid close to a thousand dollars for a new board.
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