Sorry...I think I might have taken a previous comment personally and it probably wasn't meant that way.
My advise regarding forums and dealers is this: only believe about half of what a dealer tells you; they don't know near what they should most of the time and can give just as bad advice as anywhere else. Also, listen to what people here will tell you, but if it doesn't make sense to you, verify it. For instance, MrJoe doesn't have the exact model you have, but it's probably very similar....easy enough to check and see. Same thing with the water heater....if it's Suburban, it's probably got an external switch on it.
2012 Chevy Tahoe LTZ - HD tow package
2017 Rockwood 2703WS Emerald Edition