In a post early last year (link) [Link checked on 3-08-2024.] we drew attention to Frank Lehman's discussion of recent Star Wars trailers (link to his post on Musicology Now) [Link updated on 3-08-2024.]. I can't say that I am overly fond of comments threads in general, but the conversation in Frank's post is interesting and informative. James Deaville's subsequent post about trailers to Musicology Now is definitely also worth a look: link. [Link updated on 3-08-2024.]
Between them, these materials could provide suitable background for a class assignment or a student paper project on film trailers. The trailer might make an interesting twist on the screening report (Chapter 6), for example, or on the compare-contrast paper assignment (Chapter 10).
Since trailers are now readily available for a wide range of films, both historical and contemporary, they could be incorporated almost anywhere in the chronological sequence from the classical period onward. Caution: in the transition period, what you will find labeled "trailer" online (even on the most respectable sites like Turner Classic Movies) is often just a clip of one of the film's song performances.