Additional suggestions - make sure the filters are clean. The ACs move a lot of air and filters are small. On bigger units with one AC, you may want to prioritize where the cooling goes. That is, close off the bathroom vents and remove the covers in the living area. It'll likely take a while to cool a hot trailer, especially if it's in the sun. Consider reducing flow to the bedroom via the vent covers during the day if you're not in there.
See how it works out before adding a 2nd.
In terms of performance, it's working "right" if the intake temp and the air temp at the outlets has a 20-25 degree difference.
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