OP here with an update as I mentioned. Turned out to be a non issue. Thanks, nonetheless for the responses, perhaps they will help others. The low only ended up being around 45 to 50. We turned the furnace on 60 but it never kicked on. So no battery issues obviously. We started the night in just a light blanket. But then added a heavier blanket and turned up the furnace to 64 to get it to kick on at daybreak. So, a shout out to Brian (as he mentioned) about the good insulation since it held to 63 or so while it was about 15 degrees cooler outside.
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All previous rigs below are sold - waiting until the kids graduate to the buy the next one!
'13 Forest River Sunseeker 3100 Class C
'04 Fleetwood Sedona Pop Up / Reese Mini 350 / Prodigy / BAL
'94 Coleman Cedar Pop Up
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