We absolutely camped in mid-20* overnight temp with a JayFlight without any type of cold weather package.
It required full hookup sites, we ran both our LP Furnace as well as a portable Elec heater, basically to save propane.
We depending on the duration of the cold, we occasionally would leave our faucet running at a slight trickle just to keep the exterior hose from freezing.
The pass through under the beds was where the cold was most noticeable in the trailer. We finally got smart after a couple trips and put some 2" foam in there.
2020 Ram 1500 5.7L
2007 Chevy Duramax LMM/Allison (Sold)
2012 Jay Flight 29QBH (Sold)
2012 Jay Flight 26BH (Sold)