http://talkingjeepoz.blogspot.com.au...for-grand.html
Pretty well what ARB have responded with to my internet query. I'd say that who you spoke with was simply not aware of this. ARB would be silly not to do one, as they export to the US, and the Grand Cherokee is a massive seller there.
The Caravan & Camping Supershow is on at Rosehill towards the end of April, and ARB always displays there. I'll talk to them then and see what they say.
There hasnt been a word out of TJM though. I have enquired but zero response.