You can inspect the 14-inch square gasket inside you trailer by removing the ceiling cover and remove the filter. You will see the complete gasket.
There will be four long screws there that sandwich the roof mounted A/C unit with the bottom unit and they are screwed down to depress the gasket maybe slightly less than 1/4-inch. You can tell right away if this is not tight.
These four long screws are the only thing holding the two units together...
Check for proper tightness of the gasket before even thinking about replacement. Might be a simple fix...
I check my A/C gasket on a regular basis... the I59 road in north ALA really gave me fits by bouncing my trailer going over the very rough concrete uneven slabs there..
This is neat pictorial of the A/C unit install.
Roy Ken
