I had a similar problem and found what I believe to be my problem in this thread:
I dropped my AS off at the nearest AS dealer this weekend for warranty repair. BTW, there is a two year AS warranty on bumper to bumper except batteries and tires. There is a two year parts and labor on A/C and a three year parts only on the A/C. Whatever the cause, your's is probably covered by the three year parts warranty and, depending on purchase date, might slide in under the two year warranty. You can take it to any AS authorized service center or to any Dometic authorized service center...assuming it is a Duo-therm. If it is Carrier, I don't know the warranty on those.
You may also find that running the fan on high instead of auto may help prevent tripping the breaker. There is less voltage draw in starting the compressor only than starting the compressor and fan. Sometimes when the voltage is low coming in due to so many A/C's running in the campground when your unit starts it doesn't get enough voltage and trips the breaker.
You can also try turning the unit off, pressing the mode button and holding it in while you turn the on/off switch back on. That resets the control panel. If it is OK you get FF in the panel display. Anything else means the control panel is fried and needs to be replaced. It is better explained toward the end of the above linked thread.