For our future reference, where where the fuses? in the panel over the bed or in the battery compartment? There seems to be quite a few in-line fuses in the wiring in the battery compartment. I'd like to get a chart of the location of all fuses and what they go to, just for when the time comes like you had last night. As a preventative measure to your furnace issue I would get a couple of those 1500 watt ceramic electric heaters. Whenever we are on shore power much prefer to use the campgrounds electricity than my propane. Wouldn't have heated your whole unit in that cold but may have taken the chill out.
2015 Georgetown 364TS, '14 Fiesta 5 spd w/Tandem Tow Dolly HDXL 8x10, & EZGO Customized Cart
'16 - 51 days camping so far, 19 more min planned; '15 - 56 days
2011 Flagstaff V-Lite 30WFKS '14 - 24, '13 - 33, '12 - 36, '11 - 29, '10 - 23