Hello all. After taking another look at my pictures, yep, there it is on a little plate beside the ID plate - model dump 4. T for tipper

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David, I have attached a photo of the plate if you can give any further info from that.
I am going to be in Ottawa for a meeting next week and will see if I can get a copy of Mr. Gregg's book at the War Museum, or some further info there if there is time.
Can anyone tell me about the wheel hub plates? I haven't seen a picture of wheel hubs like this and was wondering if they served some particular purpose or were they added later?
Thank you all for your help and interest.
Regards,
John