When the day comes that I have to go armed to work, I'll quit and take a job shoveling out stables. But I must admit that there have been times....

As far as I know, that Book Wagon is the only one of its kind in the US. Small trailers of books ARE used in Africa, but they are pulled by animals. This has really cool possibilities for small and rural libraries -- and it was used by the Chicago Public Library in 1940. (Horse drawn book wagons were used in Maryland at the turn of the 20th Century, and the public library in Baltimore used one as recently as 1945.)

This might be back to the future -- I've always felt that we can learn a lot from the past that can be adapted to the present.