Bedroom A/C
Yes, Bill, you can. We had to add one. Our a/c just wasn't working worth a dang when we bought our Big Horn last spring, and the factory said the only answer was to put in 2nd a/c. Well, that wasn't the answer, cutting more vents in the living area and finding crushed duct and air leaks in the slides proved to make all the difference. The bedroom unit is not ducted, but dumps directly. I suggest that you get closing vents for the bedroom and the potty, and have all the main unit working only in main living area. They just took out the bedroom vent and put the a/c unit there.
We also discovered that to cool down the rig faster when it's 95 inside, when we stop, we turn on the air with the slides still in for about 30 min before putting more square footage for it to cool down. We got very creative when we couldn't get the thing to cool down below 85. We hope we have all the a/c problems solved now, but really won't know until we get into some 90 degree weather.