The underbelly of your trailer is not well insulated and there are numerous holes in the frame rails as well as places where items are mounted through the coroplast. Additionally, there are two water lines that run through the top of the passthrough storage and the area where they go forward through the passthrough front wall is a large hole. The area forward of that is open to the outside with landing gear jacks and other holes.
You might also look at your convenience center. The bottom "large hole" where the water line enters the convenience center allows a significant draft.
Additionally, the rear passthrough wall is open about 4" at the top and there's very little insulation between the propane compartments and the passthrough, so any "cold soak" will spill over that rear wall and "creep out" the vents under the stairs. There's not a lot you can do about improving the draft that's easy or quick to accomplish. You can, when you get some time and have the space and tools to work, pull everything out of the passthrough, remove the rear wall, close up any holes to the underbelly (there are several) and rework some areas to better insulate and block the drafty, cold air from spilling through those open vents in the stairs.
Easy to do? Certainly not, and if you decide to take action, think things through before you go sealing off any spaces, remember that the warm cabin air that's spilling through those vents as the cold air comes into your trailer is what keeps the water lines that you don't see from freezing. So, you could easily "insulate the cabin" so you're warm and in the same process, assure that all your plumbing runs will turn to ice from lack of heat.....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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