Why “bookmobile” is a great word
A vehicle, typically a large van, equipped as a traveling branch of a library to lend books and other materials. From book + -mobile (a suffix meaning 'moving vehicle,' from automobile), first recorded in 1935–40. Unlike a library branch, which is stationary and rooted, or a book van, a more generic and utilitarian term, a bookmobile is a democratizing mission on wheels—the rumble of a diesel engine announcing knowledge at the edge of a rural town, the scent of aging paper wafting from its opened doors, the specific gravity of its shelves packed tight with possibility. It represents the quiet, persistent belief that knowledge should go out to meet its seekers, wherever they are.
Definitions & examples from Wiktionary (CC BY-SA 3.0).