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When you are running the a/c, is your fan on "hi-speed"? That is usually necessary to ensure proper airflow across the evaporator.
If you are running your fan on hi-speed, it is possible your refrigerant is low.
A proper-running a/c unit should not freeze up. I live/camp in very high humidity areas and have no problems with freezing. I run one, two and three a/c units depending on the temp and how hard it is to cool the camper. Still no freezing.
You can set your a/c unit to as low of a temp as you want and should not freeze. If you set the temp too low, your a/c may never cycle off... but it should not freeze.
Also, if your a/c is not big enough to cool things down, it will just keep running and never cycle off... assuming a properly functioning unit.
As far as "rain" when the evaporator thaws... that is normal (although the freezing evaporator is not normal).
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