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Wiktionary
lovemobile

n. (context informal English) A float or truck that carries sound equipment, dancers, etc. at music festivals.

Wikipedia
Lovemobile

A lovemobile is a popular name for a float. These lovemobiles are trucks with flatbed carrying sound equipment, a DJ or other live act, dancers and props, which is used as a central element at technoparades. The setup and decoration of a lovemobile takes place in the days or weeks preceding the event. The lovemobile is driven at walking pace through a crowd of ravers as they dance to music powered by the truck's electrical system.