[Pahaska]

TrailManor installs standard household air conditioners in the cabinets of all their smaller models. They place the ACs in a plastic drip pan and vent through the side of the trailer.

I think instake air could come from underneath the trailer, but you would probably need a vent in the trailer side such as TrailManor uses to get the hot air out. A refrigerator vent such I have in the side of my International would probably do the trick. In the TrailManors, the addition of a muffin fan to increase airflow greatly improved the cooling ability of the AC.

Thge photo shows my refrigerator vents. They are aluminum and wouldn't look out of place on an older A/S.