my trailer also has dual a/c's. Sometimes it does the same that you are talking about. If I turn off the front a/c it doesnt do it. I think the fron a/c blows across the thermostat and it shuts off the main a/c then the main a/c goes to kick back on to soon and puts a huge load on the generator. Short cycling I think they call it. Does this sound right JOEDUNER?