Hi P : In the case of our portable air conditioner...it has a resevoir (tub) for water inside it & I've actually run it for two full days prior to the float tripping the unit so that it stops.
Anyway, to answer your question...when I decide it's time to expell the water (usually once per day) I turn it off, disconnect the hot air exhaust hose from the back of the unit & wheel it over to the doorway.
I then connect the 3ft plastic hose that came with the unit to the lower of the two water ports & then let the water drain out through the hose that I position under the trailer, away from where we step down.
Once it's drained, off goes the hose, it's wheeled back into place, hot air exhaust pipe is re-connected & air conditioning
is rolling again until the next day.
The whole process takes about two minutes form start to finish.
Of course, this solution might not be the best answer for everyone (our trailer is a front dinette model, so everything fits..) but it works so perfectly for us, IMHO solving the air conditioning
problem couldn't be easier.
For those that may want to see this in person...the Admiral, the schnauzer & I will have our Trillium
at the Bolerama in Long Beach this coming weekend.