Ok, that previous post didn't fix it.
At last, at last ... the heater has been fixed. The dealer tried all kinds of stuff to get it running and finally called Suburban and talked to them. He said their suggestions were really helpful ... leading him to believe the "hitemp" sensor was faulting because of restricted heat output.
The heat "hoses" that came from the heater and go to the camper's duct work had some pretty sharp bends in them and they "straightened" the hoses. They also connected an additional 2" hose that simply dumps into where the water heater is. Finally (we had a really nice long chat and on site explanation of everything) he noted that the sliding panel that's between the heater and the "garage" might be blocking the intake of air for the heater. He suggested leaving the panel slightly open. I think I will probably put some sort of vent device so as to stop any critter attacks (we don't currently have critter issues ... but you never know). Now I'm "Joe Happy Camper".