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The trailer is a Thor Tahoe Lighthauler. The transformer is a PD5110 Series Generator Transfer Relay Type1 by Progressive Dynamics. When I went out there to get the model number it was no longer making any noise? But it's been running for days?
The noise is coming from this box...so I guess it's the transfer Relay that's making the noise not the converter.
What your hearing is ' sine wave chatter' and can indicate a poor grounding situation, dirty power input, of the realy beginning to fail..........What I would do is run the generator and see if it stops..........I realize it will be hard to hear.........make a stethoscope with a long screwdriver, wrap your hand around the handle, and place it to your ear, then touch the box, you will hear it if its there, this will ck for dirty power,,,,,,,the grounding you can ck by inspection..................