See the recent threads regarding Watt, using search helps to retrieve information quickly. The Roadtrek company would be the best source of information regarding your questions. I noticed you have 2 threads regarding Roadtrek, if you get answers from Roadtrek please share.
Have you had RVs or this is going to be your new venture. It is interesting that from all topics related to B-class RVs you dived to Watt system rather quickly, what prompted your interest?