FYI to all those with similar moisture problems;
I want you to know that the advice about running the Air conditioner, and the Heater at the same time really does work to remove the moisture from the camper. I've done this for the past couple of days, and when I woke up this afternoon, there wasn't any condensation on the trim/ceiling like there has been despite the leak at the ceiling vent.
My unit has dual controls, but if your unit has single controls, they can easily be switched out to a double thermostat set up. It's just a matter of switching the thermostat wires to the new thermostats [one heat thermostat, and one A/C thermostat]. I never got mine to run smoothly together, but honestly, I don't really care because it works