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Brad, check engine preheat pump and lines at the Aqua Hot.  Main engine coolant pump moves engine fluid through those lines anytime engine is running.

If found leaking, the hose to and from the engine can be disconnected and looped till leak fixed.  Everything works fine with hoses looped.  Just no preheat in real cold weather and no Aqua Hot coolant heating by engine driving down the highway.

Nice call Rudy.  Thanks to you, Richard and Bill I got to the bottom of this.  I had a pinhole in one of the lines that runs from the manifold back at the engine that goes to the Aquahot.  I was able to close all 4 valves so I'll be able to get home. 

While being under coach I noticed something else dripping and it was the fuel line that runs from my fuel pump up to the primer pump.  Was a drip every 4 seconds or so at idle.  Thankfully the NAPA in the little town I'm staying near makes hydraulic hose in house so we'll be going there in the morning to have a new hose made.  As much as this coolant leak frustrated me and burned a day of our trip I am super thankful to be able to find a solution and to have caught that ruptured fuel line.