Doing a bit more looking/thinking, there are a couple items which I would want to look over in prepping.
You likely know but just wanted to point to a few things like how far from the outside plumbing might be run can change what happens a whole bunch.
I marked a couple suspect points to look at how heat will get to them.
With four ducts, it looks like they built a good plan but it pays to check!
Click these drawings to get a better view but can you feel warm air blowing near these spots?
The wet bay is often a suspect as it has the outside door for leaking cold and then the plumbing for the shower seems to run along the outer side and back for a long way? That make it suspect if not heated?
What I look at when caught in cold is what may be too close to the cold outer side. Looking from above and drawing a shaky outline of the RV, the kitchen seems to be much better protected than other parts.
I hope your RV is much straighter than my drawing!!!
A small point to consider as a help is how we can leave some of the cabinet doors and drawers open overnight as a way to let warm room air into all those little nooks and crannies where they tend to run the water lines. Those lines running along the side and back might need a close look.
We've always found a lightbulb like a trouble light is a good way to get heat to any specific spot we worry about. Not so hot it might melt things or catch fire but they do put out lots of heat for small spaces.
The problem for me in keepiing pipes from freezing is the way things are built with no freezeproof faucets or any way to add them in slab foundations and we have a harder time doing the winter prep because we may need the hoses and faucets for keeping plants alive one week and freeze the next. I've spent twice as much time fixing pipes here than any place I have lived!
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