Burley Travoy trailer is 10 pounds and has a quick connect for easy on and off and a 60lbs capacity. http://www.youtube.com/watch?v=wB5bbHmDpjM
You could strap a book case to and just wheel it to classes. It tows smoothly without much change in bike handling. One guy toured 900 miles in New Zealand with one.
It would add substantially to your Fred Factor but will reduce the dumbass factor by the same amount.

Randy