I really can't answer your question since I have a 2016, 34RL Cedar Creek with two A/C units. But our front bedroom at night will become uncomfortable when we sleeping.
What I have found out that's seems to work for us and this may help you also. Is too turn the A/C unit farthest away from where you are sleeping, to run the fan on manually mode at some speed of your liking. This will keep the air moving in your trailer during the night. Which will make the unit more comfortable when sleeping.
With our Dometic thermostat you can control the fans in the A/C unit for each zone plus the A/C and or heat for the zone one only. So, by setting the temp at 72 (for us) on the rear A/C and the fan to manually mode on the low speed with the front A/C off we are comfortable. My wife is a light sleeper and the front A/C will keep her awake so, this is why it is off at night.
Just a thought that may help you with air flow.
2016 34RL CC; 2008 Ram Mega Cab 2500HD, 6.7L, 68RFE 6 speed, 4X4, Smarty S67, TDR 135K+miles