If you wish to go freedom camping in New Zealand, your vehicle must be self-contained and certified.
This means you must be able to live in the vehicle for 3 days without needing additional water or needing to dump the waste.
In addition, the vehicle must have:
A toilet
A shower
Wastewater storage
A rubbish bin with a lid
The vehicle must have been checked by a qualified officer to ensure that it meets these requirements. Self-contained motorhomes have a sticker displayed on the vehicle proving their certification.