This isn't an Air Conditioner... it's a "Evaporative Cooler".
For lack of a better definition, an air conditioner refrigerates and removes moisture for the air, an evaporative cooler puts slightly cooler & moist air back into the air and, as such, only works in dry climate conditions.
If you read the specifications it clearly tells you that it will dump up to a gallon of water back into your trailer overnight and, if you forget to empty it before getting underway, it may do that when you are travelling.
We had one of these on our Airstream many years ago, a total waste of money when not in the middle of a desert.
And, as mentioned above, they are a source of mold if not kept very, very, clean.