2004 Holiday Rambler both A/C units stopped working

1. 5 Button tstats rarely fail.
2. You did not state IF you had a display on the wall tstat. DO YOU?
3. The 5 button CCC uses a Phone cable type communication and is extremely difficult to test without using a test cable.
4. The Roof AC units run off 120 power and the tstat runs off 12 volt power from the FRONT Zone 1 AC unit.
5. Odds are you have a corrosion issue at the front Phone type cable at the front AC connections. This is probably true if you have Lo Profile Penguin units on top.
6. I would NEVER use a OEM support for my diagnosis and troubleshooting. They are NOT trained Technicians on the phone.
7. IF you have no tstat display then the odds are the problem is at the front upper AC unit communication connections. Doug

Question, when the bathroom gfi kept tripping would the a/c trip with it? Are there any other plugs out right now? Typically the A/C should not mess with the bathroom plug whatsoever.... Any chance you knocked a breaker loose?

Do you have 12.6V+ DC to the A/Cs and the thermostat? Both of our rigs use DC to control the A/Cs etc. Do you have AC on both legs of the 50A circuit to the CB panel? Is the load shedding working OK?