"jtad".....You can try a couple of things. First, try it with one A/C. This will eliminate an A/C unit going bad and drawing too many amps. If that's not the problem, turn off your battery charger. I'm not familiar with the Zantrex, but on the Magnum inverters, there is a button to shut down charging. Lastly, if you have the inverter on while running the A/C's, shut the inverter off. This will be the easiest way to make sure something in the coach is not drawing a big load before jumping into generator issues.