I have a 2017 and was told by the dealer if you open the emergency exit window it will fall out and probably break. If the window does come out and doesn't break it is very difficult to replace. I leave it alone! The small window under the tv will flow a good amount of air if you turn the Maxx Air fan to exhaust. If your coach is 30 amp you can open the bedroom ceiling vent, I would recommend installing a vent cover first. If your coach is 50 amp with dual AC your only option is the small window.
Dave & Myra
One day your life will flash before your eyes,
make sure it's worth watching!