A road trip is the essence of freedom, when you can spread out a map and wander to mountain lakes, through small towns, and along forgotten back roads. The open road calls to everyone who’s given a moment’s thought to adventure, whether that means sampling diner food along the way, setting up camp at night, or stumbling upon fun drive-in movies in the middle of nowhere. This adventure you’re dreaming of does not include afternoons spent at auto shops hoping…