We have camped in nighttime temps down to the 20's.
I Don't have pugs or anything else for the tent ends.
I run the furnace and set it on 58-62. Use enough blankets to keep warm.
It's important to control humidity in the trailer during the day, always use the range hood fan and open the roof vents and crack a window or 2 while cooking. Install a good exhaust fan in the bathroom vent to pull moisture out when using the shower.
To prevent condensation at night I Slightly crack open the roof vents, and run bunk fans to circulate air into the tent ends. Have never had condensation in the bunks.
Gary