I have a 2013 JayFlight RKS26 with the thermal package. I called Jayco last fall and asked, they said it should be good to 0 degrees. We went camping in the mountains - got down to 11 degrees. We "skirted" the trailer with tarps, disconnected the city water at night (just used the internal tank), and had no problems. Probably would have been worse without the skirting, though, as there was a lot of wind. Beware of using too much auxiliary heat (electric heaters) in the trailer - the propane heat runs through the underbelly and keeps temps moderated. If the cabin is warmed, the thermostat won't turn on the propane heat. You'll be comfortable, but the underbelly will be colder.
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