The power cord is too small. Let's say it is 14 gauge orange extension cord. Rated for 15 amp. And that cords is 50 - 75 feet long. If you took a voltage meter, and read the voltage at the plug in for the camper, when the A/C comes one, you will see a voltage drop. It may even drop to 75 volts, instead of 110 to 120.
When this happens, the amperage draw increases, causing what is referred to has (Low Voltage, High Amperage).
This will over heat the compressor fast, and the internal over load opens, disallowing the compressor to run.
Increase the size of your power supply, and shorten as much as possible.
Or, use a 10 gauge extension cord.
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