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The winery's chief executive, Fraser McLachlan, said the van was parked by two visitors who then went inside for a wine tasting.
They had left the handbrake on, but apparently it had failed.
"They enjoyed the wine tasting, but got a bit of a surprise when they went out."
The van was recovered that evening and no damage was done to the pond, he said.
Kiwi Campers did not respond to a request for comment.