As Sourdough said, you should be OK with the thermostat set on 55. If (IF) you have the trailer plugged into electricity. If you're relying on a single battery to provide power for the furnace for 5 or 6 nights, you'll have a dead battery (probably by the second day) and from there, it won't matter what the thermostat is set on. If you are plugged into electricity, the furnace should keep you "safe from freezing" for 5 or 6 days, but after that, depending on the propane usage, you'll probably be out of propane.
Good Luck
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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