I was just browsing about and found this interesting web site, About the 4WD Handbook | 4WD Book & 4X4 News
One of the pages is a list of 4bys wanted for product development, and the WK2 is listed for development of a rear carrier. So if you are in Melbourne and want to help out then check this link ...
The 4X4 Test Car Page | 4WD Book & 4X4 News
PS ... It does say that it's current as at Feb 2012 which is quite a while ago now, but it might be worth checking it out anyway.