Need more answers
1. 1997, EMS may be a factor. Do you have the Climate control wall tstat Intellitec system that Fleetwood installs?
2. Or do you just have a Front/Rear manual AC switch?
3. If the previous AC units worked correctly until they failed and then the problem came up with the new install, then the odds are the installer did something wrong. BUT, installing 2 new AC units would not involve messing with the Intellitec system/wiring if you have that.
4. Did you install the SAME brand roof AC units?
5. You state the AC fails. WHICH AC? Does the other one operate OK?
6. BOTH will operate on Genset. What happens when you run the Genset? Doug