For those of you interested in things with tracks, this is an interesting site - especially as it deals with the Kangaroo 1st Canadian Armoured Carrier Regiment Association
I was looking at the Kangaroo relatively recently when we had that request about a Candian armoured car unit in the UK, IIRC. Never got anywhere with my enquiries. EDIT: Here's the thread I mentioned: http://ww2chat.com/forums/unit-history/1942-12th-armoured-car-did-exist.html