I just had my dealer install 2 new vents at the forward end of the built-in foam AC ducts. (on my dime) These ducts run from the AC vents in the bedroom forward to the cross ceiling divider just aft of the skylight. I have not had a chance to see how effective they will be in hot wx, but there is good airflow from the vents and it can be directed to the kitchen area and the theater seats. Don't know if THOR picked up this idea or not.
After that divider the AC air goes into small tube ducts to the front bunk area. I'm presently on the road but I hope this photo helps.