Its an RV, not the space shuttle. I don't believe there is a lot of high tech work goes into the engineering and installation of the heating system.
The system in our 09 Montana is so unbalanced that the only vent that you can feel air coming out is the rearmost vent, the next vent forward won't blow out a match but you can sort of feel air coming out, the next and last forward vent is in front of the refrig and very little air comes out. Nothing comes out the vents in the bathroom and bedroom.
I looked for balance dampers at the heater and found 5 four inch cheesy foil ducts attached to the plentum with nothing to balance the system anywhere in the system.