Bookmobiles are the modern version of the travelling library wagon. American farm wagons are more rare a century later. This is a quote from the text of Carriage Monthly, July 1910, Suburban Life:
“When a public library undertakes the task of ministering to the intellectual requirements of an entire county, it soon learns the necessity of departing from the beaten paths of library methods to blaze a trail through the wilderness of untested theories and untried experiences.”
That bookmobiles sometimes suffer the effects of budget cuts does not necessarily mean we will revert to horse-drawn library wagons, but it is an interesting idea.