Two possibilities.
One, have you turned off all other 110v circuit breakers... including your converter? Otherwise, when you plug in to the power station the converter will attempt to charge your batteries using a lot of the available power. And, no other AC loads should be running. not even a charger or TV.
Lastly, looking at the specs for that unit my personal opinion is that it doesn't have enough power. The specs listed are best case, shortest time, with a big downhill and the wind at your back kind of "2000w'. Even a Honda 2200i will struggle with running your A/C unit and it's rated at much higher output than your power station. Your soft start helps on compressor startup, but not after that. It can only do so much.
So, first make sure everything else is off in your trailer- which is a bummer to not be able to use any AC just so you can kind of run your A/C for a little while.
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2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad
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