Looking at pics of your unit here:
https://www.theoutpostrv.com/New-Inv...#gallerySlider
your furnace is on the curb side under your stove, that grate under the stove is the cold air return. So it appears you only have two heating ducts, one on the rear of the kitchen cabinet by the curb side fold-down sofa, and one in the front of the kitchen cabinet by the entry door.
If you want more heat in the bathroom/bedroom, you'll have to leave the door(s) open or use an electric heater if you have shore power.
Seems they could have put the converter/breakers under a shorter pantry and put the furnace under the fridge and run the front duct into the bathroom. It would have given you a little more "kitchen" storage, too.
This is something you learn to look for. My Roo 19 had one duct into the bathroom, which was good, but the other duct was right next to the cold air return, so a lot of the hot air simply got sucked into the cold air return. And as you can see, they could have easily have put the duct on the outside of the bench, into the aisle, rather than under the table.
Of course, there was NO air to the rear bunk.