Really depends how you want to use the coach..you would loose the motor aid (coolent exchanger) feature. whether its 1500w or 1200w your inverter & batteries wouldn't last long without the genny I didn't connect my water heater into the inverter buss.. I sorta like having the hot water going down the road... Yours is a bit different than mine.. as I additionally have a propane burner(3 ways).. i've attached a link to some info ..
http://www.raritaneng.com/pdf_files/...eaterv0502.pdf