J&R wrote:
The drip pan should have an outlet or hose to drain to outside. Insects love them. Build nests and pan overflows. Worth a try.
"Window" A/C units are a "High Efficiency" type of A/C.
This type of A/C DEPENDS ON WATER IN THE PAN, it uses the fan wheel on the outside to "splash" water from the condensate in the pan on the outside fins. This increases cooling capacity considerably without using more energy.
Many window air units do not have a "plug" or "drain" because of the water slinging and evaporation.
Because of this, you MUST ensure the A/C unit has ENOUGH slant to the outside. Since you can't adjust that unit like you would in a window you must make sure your trailer is level or slants slightly in favor of the outside of the A/C unit.