Mickey and Donald ride in a trailer pulled by Goofy, who doesn't realize his car has separated from the trailer as they travel down a mountain.
Goofy's in the driver's seat, Mickey's in the kitchen, and Donald's in bed in Mickey's high-tech house trailer. When Goofy comes back to eat breakfast, leaving the car on autopilot, it takes them onto a dangerous closed mountain road. When Goofy realizes this, he accidentally unhooks the trailer, sending it on a perilous route. They come very close to disaster several times, while the oblivious Goofy drives on and hooks back up to them.—Jon Reeves <jreeves@imdb.com>
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. 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.