When it comes to synonyms for the term "sound truck," there are several options to choose from. One such synonym is a "boombox truck," which refers to a vehicle mounted with an oversized boombox or sound system. Another alternative is a "mobile DJ truck," which refers to a vehicle that has been modified to function as a portable DJ booth. Other options include a "loudspeaker truck," a "soundstage truck," or a "rolling concert." Each of these terms describes a vehicle that has been equipped with a high-quality sound system and is used to deliver music or other audio content to its listeners.