Wicked's owner is obviously of the view that any publicity is good publicity. It is true that some of the slogans are a bit clever and risqué. I wouldn't get around with them on my car but I can see how they would appeal to the target market for their vehicles: young backpackers, the type who are here for a good time not a long time.
However too many of their slogans are misogynist and otherwise offensive. This is why there has been some push back against them recently, including members of the public spraying over the vans. Now local councils are also starting to take action.
http://www.abc.net.au/news/2016-04-0...e'/7303336
http://www.abc.net.au/news/2016-04-2...ns-nsw/7361644
And they don't have a clean record in other areas either.
http://www.abc.net.au/news/2010-01-1...-roads/1203300