A/c condensation

Nothing to worry about but you may want to use a small dehumidifier.

Well got another call, its just not able to keep up during the day. She says its 87 degrees in there. air is cold coming out of unit and the voltage coming in on my EMS shows 115V. This trailer is only 6 months old with a 15000 unit at 23 ft.

Is she doing a lot of cooking? Is the filter clean? Are all the supply vents open? That size A/C should be able to keep up in a 23ft. unit. Condensation at the air return would seem to indicate that it may be recirculating air at the plenum area.

I know she did open the vent on the unit to bypass the ducts to try and get it cooled down.

When it's high humidity, they don't cool right. Had the same problem while staying by the beach in Galveston a few weeks ago, and I have two a/c's. Fridge never cooled right either. Got back to dry West Texas and all is good. Go figure.

I too have a 23' TT with a 15K BTU air. It was around 95 today with like 90% humidity. I've been working in the trailer in the driveway all day going in and out. The temp inside has stayed below 68 all day.

If you have ducted air make sure none of the outlets are closed. If you have moisture at the return air vent (I assume you mean in the ceiling unit) I would suspect you may have a freeze up issue. You can remove the filter grill and look at the evaporator coils to see if there is ice forming on the coils. That would allow moisture to drop back as the ice melts.

Freezing is most likely caused by insufficient airflow over the coils and is exacerbated by the high humidity.

Make sure the filter is not obstructed.

Make sure the fan is running on high.

Some units are poorly sealed between the return air and supply air side of the air distribution system in the plenum. This too can cause freeze up.