Dave, thanks for the info. I really like the ductwork diagrams that you sent. I plan to give it a try. Do you know if there have been any problems with condensation, moisture and or mold due to using wood? Also would a third vent be worth the effort?
By the way, I wrote that I have a 2020 camper. I made a typo. It is a 2022 and has the HB9000 heat pump. As I said before it seems to put out a lot of cool air but only cools the floor area.
Thanks again,
Nate and Karon