Tricks for keeping restless passenger happy while towing?

Before any of our trailer trips, we visit the library and get several books on CD. Nothing makes the miles melt away like they do. We make a point of getting books that are easy to follow. Stephen King, even Clive Cussler.

On our last trip from Michigan to Gettysburg, PA, by pure coincidence the book we were listening to took place right where we were driving; northwest Pennsylvania, in the fictional town of Barronville, and we drove right by Barronvale. Weird.