Michael,
In an earlier post in this thread, you said that your front and rear A/C units were both running. Unless your coach has been converted to roof A/C units, your coach only has one basement A/C. You A/C unit has two compressors and the thermostat will automatically turn on the second compressor if the inside temperature gets more than 2 degrees above the set temperature. So if you are on 30 amp service, you need to go to the breaker box in the rear closet and turn off the breaker for the second compressor to prevent overloading the circuit. The thermostat and A/C unit has no way to tell if you are on 30 or 50 amp service.
Gerald