Possible bad control board
SOURCE: Circuit Breaker and Dometic Rooftop RV Air
Since your RV A/C works O.K. when plugged in to the land line and the trip happens when you run it on your generator the problem may be related to the generator output. It is possible that the power being supplied by the generator is not handling the surge when the A/C starts. Starting Amperage on start up is about 5 times the running Amperage for about 3 seconds until the compressor comes up to its rated speed.
Possible fan relay is defective, does outside unit come on ?
SOURCE: Relay (?) sticking Dometic RV rooftop AC
Go up on the roof of the unit and remove the AC Shroud. With the unit running, see if you can pinpoint where the sound is coming from. The only thing on the entire AC that would make that much of a vibration would be the fan motor. Not sure what would cause the fan motor to do this. The compressor may do that but only if the windings are bad and then it would not be cooling.
SOURCE: How to identify the btu of rooftop AC unit
ANY # DIVISABLE BY 12. MODEL HAS 12-24-30-36-40-48-54-60 12 1 TON 24 2 TON 30 2 1/2 36 3 TON 36.00 BTU 40 3 1/2 48 4 TON 48.00 BTU 54 4 1/2 60 5 TON 60.000 BTU
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