Help with markings and #'s on new truck

[rob love]

I have seen the CAR type number on vehicles which I know were released at the end of the war. I beleive these numbers were started around 43. The first CMP I ever restored had both the early number (41-1-1085) and was overpainted with a CAR number
A4 RCATC
Z
52-XXXX
on it, and it was purchased by the previous owner in 46 right out of Shilo.
Maybe the best way to get a cut-off date for when the DND numbers went to the new style numbers would be to run through one of the unit war diaries. I actually ran through the diaries of A4 RCATC looking for reference for my truck, and while I came close, I never hit it right on. The only real references to vehicle numbers that I found were directions to officers to do summary investigations on traffic accidents between trucks (and in some cases guns).