I blocked one of the supply vents in our bedroom by cutting cardboard circle and also blocked one half of vent in the bathroom forcing air to liv room and bunk room. also put liv room fan on constant low speed , also tell all to use back door so not pull hot air into unit when open main door over and over again. also helps emensly to add "REFLECTEX" TO ALL windows, cut to fit. 50.00 a roll. some will say not good to block vents, but works great all are cool and happy campers...even in the bunk room. The problem we have whether vents are blocked or not is,
my sweetheart loves it cold so we set bedroom on 66 and other ac on 70 and our bedroom "plentum" (inside ac box) sweats so bad it drips on or bed!! BTW I went up on roof and removed bedroom ac cover and then the top of plentum box and saw 2 areas not sealed good where hot air was being pulled into ac. I sealed them but that did not help the sweating though. I called dometic, they said turn your ac up to a more human tempature.
I an going to fig out a way to better insulate the plentum box on the roof. well hope this all helps someone else.