ad truck

ad truck (plural ad trucks)

1. (advertising) A truck whose sole purpose is to advertise, for example by means of billboards, electronic displays, or music.
   • 2004, John Dalton, Heaven Lake, page 449:

     An ad truck passed down the lane blaring out a shrill announcement for a new perfume and cosmetics line that would be available Saturday in the town's department store.

• mobile billboard