The Cute Caravan Company
The Cute Caravan Company is a fully staffed mobile bar service built around a restored Lilliput caravan called Lilli, complete with premium glassware. Based in Auckland, they travel to weddings and private events wherever the caravan can reach. The bar staff and setup are included in the hire.
Their full menu and bookings live on their own site.
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Others in Auckland, and vendors serving something similar.