Talked to Fleetwood
1. They built very few of this type system
2. They suggested to turn OFF the AC breaker. But they did not state where it was if not at the main breaker panel. IF you have 2- 20 amp breakers in your breaker panel, they are for the roof AC units.
3. It is an Intellitec system and Fleetwood calls it the ECC-2.
4. The Intellitec wiring schematic shows 2 separate 20 amp breakers at the main breaker panel. Each goes to just 1 AC, so, if wired to specs you should be able to kill either AC from its appropriate breaker. Doug