"I am having a very hard time believing our battery would die after only 2 weeks of not being plugged in, especially with nothing drawing power that I can think of. Any ideas???"
It would not be unusual for a single battery to be drawn down in two weeks. Especially if not fully charged after being used for three day's.
Even if the cut-out switch was engaged there is enough parasitic draw to cause the problem.
Second the notion of battery removal for winter storage.
POI...our Interstates were burned out at delivery,
(dealer kept them plugged in 24/7 without monitoring there condition). Might want to load test the battery, check for shorted cell.
"Sticks & stones can break your bones...and hail will dent your Airstream"
So when is this..."old enough to know better" supposed to kick in?