[JRTJH]

To add to dcg9381's suggestion of turning off all other circuit breakers except the A/C, keep in mind that the converter/power center will draw between 500 and 1000 watts depending on the level of charge in the house battery. So if you've used the trailer 12 volt systems overnight and waited until it gets hot during the day to then recharge the battery while running the A/C to cool down the trailer, you'll very likely be consuming more watts than a 3100/2800 watt generator can provide. As soon as you plug the trailer into the generator your converter will "sap up to half" the generator output. With a 2000/1700 watt Champion, the converter can consume nearly the entire output if you've got a dual 6 volt battery bank and it's down to about 50% charge. The demands placed on the generator by the converter can be enough to essentially cause the generator to bog down with the addition of any other "large consumption device" like the refrigerator, water heater, microwave or ???

So starting the A/C while the converter is in a "high charge status" would be a very difficult/impossible event with the generator in "ECO" mode and would be "touchy" even in "NORM" mode.