Sue and Gene.
I've begun the planning for installing an AC unit in our 1991 Scamp
16. My plan is to put it in the bottom of the Hanging closet. Our hanging closet has two doors and we plan to use the lower door for a 5000 BTU AC unit and above it a Hamper.
Many have used the bottom of the hanging closet for this purpose, ventilating it out the side of the trailer. My approach will be a little different.
This means cutting the front below the bottom door of the Hanging closet. My plan for ventilating the AC unit is to cut two holes thru the floor and insure adequate ventilation with two fans, one blowing cool air in and one sucking warm air out. I plan to use two 12 volt computer fans. Also I will allow water to drain out the bottom.
A search of the forum should show what others have done.
Once I start I will provide pictures in the modifications area under Preparing a 1991 Scamp