Also, the cover is black which will absorb sunlight and turn it into heat like crazy - drastically cutting the efficiency of this AC unit. In getting your installation fixed, I'd strongly recommend getting the cover sprayed silver to match the Airstream, with the top sprayed white.
I'd also have a big red number painted on the AC, so it is visible from the air and traffic cams, so if your AC is ever stolen, they'll know to look for the trailer with the "73" painted on the roof
(Hey, don't everyone do this, or too many innocent people will get pulled over! Gah, ruining my own plan for identifiability by telling everyone!)