This photo was taken on Lake Taupo at Boat Harbour near Kinloch. Note the crystal clear water. My boat is on the right. The other yacht is a 30 footer. It would be more comfortable inside. However it is too large to tow this on the road because of its width. Larger yachts like this are tied to moorings or parked at a marina which has easy access to the sea.
The largest size trailer yacht that can be towed easily on the highway is around 25 foot. If the trailer width is greater than 2 metres, a special pilot vehicle with flashing amber lights must go in front of the towing vehicle to warn on-coming traffic of the "wide load" following. This becomes too inconvenient to arrange for frequent movements.