I do not know about Newfie owned vehicles, but I do know that the Canadian Army in Newfoundland uased Canadian home service markings.
A photo of my Dad with his WLC Harley-Davidson motorcycle can be seen on my web site at:
http://bcoy1cpb.pacdat.net/a_h_stevens.htm with DND number 42-1-5561
I have quite a few photos he took, his Newfoundland Driver's Licences, scrap book items, maps etc.