They will not use it.
The commercial vans have them now, after some casual conversations when doing farm tours they have many and varied reasons why they wont use it.
It has to be set up outside the van, especially if its a group of friends travelling rather than a couple.
They don't want to clean it. Some believe there will be an extra charge if they do use it.
The smell if it is offensive to them.
Its often stored next to a food prep area.
No privacy outside so it has to place behind a bush and why carry something to a place you can squat anyway.
NZ doesn't care, everyone is doing it......
Most would be happy in camps if they had to, especially if there are a few extras like free wifi.
Girls often mention they can talk their way out of a fine or infringement notice, and most believe its not that serious. (the ones clamped in Qtown weren't so flippant)
Some even said DOC fees are per site rather per person
To keep the conversation going I cant inject my views I mostly just answer questions.
Guests words not mine and aprox 300 of this type of tourist per month over the summer give or take.