Mickey’s Trailer (film) Mickey Mouse cartoon; released on May 6, 1938. Directed by Ben Sharpsteen. On their trip out of the city for a vacation, Mickey, Donald, and Goofy plan on having lots of fun and relaxation with their trailer, but all does not go as they plan and they soon have their hands full when the trailer gets away from them. Despite a steep mountain road and a speedy express train, the car and trailer eventually meet once again. Includes some fun gags about marvelous contraptions built into the trailer.