Kind of an old thread but...
AF is builds their RV's kind of odd.
If you can install a second air, you will have the 50A option and there will be a blank junction box plate convering the Romex to feed it. If you do not have 50A then the roof was not structured for the extra weight and there's no wiring or CB in the panel for it. Also, even if you're all set up for second air, it will be a stand alone unit and will not be connected to the thermostat - again, this is a Northwood corner cutting thing.
They made a mistake on mine and had to remove the roof and restructure it for second AC. They gave me a free second AC for the trouble but the trailer will never be the same.