Book Trailer

Now, what is a book trailer used for, to introduce a book to students or should we be having the kids do book trailers for the books they read? I could see where having students do them would be awesome. We have Drop Everything and Read at my school and we have to provide the books; a lot of my kids do not know what to read when they head to the back of my room for a book. I could have each kid read one book and then create book trailers to advertise that book to the rest of the class so that they get excited about DEAR and get ideas about what to read. However, I also feel that would be so time consuming and not geared toward my content. The books in my room are supposed to be books kids would like to read, not necessarily anything to do with my content, but I guess if I am going to have to put my efforts into DEAR once a week then creating book trailers will be less time consuming than waisting one day a week for the entire year.