You don't say where you are staying. If you are in a large campground and many of your neighbors are running their AC in 90 degree weather, it is possible that the voltage is getting low. When the voltage drops, the compressor motor draws more current to do its job. Also the AC cycles on and off more frequently due to the heat. When the pressure in the system doesn't have time to equalize due to short cycles, it causes the compressor to work harder ( aka draw more current) to start. On hot days turn off water heater or change to propane.
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