Per the site: So what is a Content Trailer? Very simply, a Content Trailer is a short, 2- to 3-minute, media-rich experience from which a point of inquiry can begin. The vehicle is unimportant in the relationship to the concept. Providing students with the images and sounds that can be attached to the textual information that they will be exploring can provide a profound shift in the way learning is engaged. Content Trailers can be one tool to help the process of inquiry begin.