Here's a question for you:
If you turn everything that operates on AC-Voltage to OFF, even unplug anything in the receptacles, and even turn your AirConditioners to OFF, does it still kick the generator's breaker?
If it does, then the problem is definitely in your RV wiring. If not, one of your electrical appliances, or the Air Conditioners, is your problem.
And, if the problem happens when everything is OFF, you need to examine your wiring closely.
By kicking the generator's breaker, your RV must have one of your AC-voltage lines shorted to ground.
Here are a few things to check;
1- check your power cord from the generator to the RV for damage or bad connections.
2- check that your AC-Voltage breakers are operating and work properly.
3- check that where you rewired things there are no loose wires that might be shorted to other wires.