Jeff Daniels composed "Recreational Vehicle" song for his charity album "Jeff Daniels Live and Unplugged". The song was about his personal RV misadventures.
A life-long fan of camping, Jeff Daniels has owned an RV for years. According to a Detroit radio interview, his RV driving lessons for the movie were quickly canceled when he arrived on location in his personal recreational vehicle.
The salesman, Irv, (pictured on the right side of the RV) is, in fact, director Barry Sonnenfeld.
All three of the Gornicke children are named after former NFL players from the Houston Oilers: Earl (Earl Campbell); Moon (Warren Moon) and Billy ('Billy "White Shoes' Johnson').
The script originally called for a 1990s recreational vehicle, but Sonnenfeld wanted something more classic. His search yielded two 1948 "Flexible Clippers," which were used in the '40s and '50s by such companies as Greyhound and Trailways. Both were in reasonably good shape when the production acquired them. The seats were stripped away, the bodies restored and painted an eye-catching red and cream (they were originally blue and white) and outfitted like vintage motor homes. Other exterior appointments included "eyelid" shades over the headlights, a chrome ladder up the back and a wooden roof rack to complete its distinctive classic look. The second bus was completely rebuilt, including engine and drive train, with only about 60 percent of the interior restored. It was used mainly for stunt work and second unit exterior shots.