At the risk of demonstrating stunning ignorance here; could they be talking about 'Quad' rather than 'Chad' ?
A 'Quad' is just an army term for a four wheel drive, and the term is most commonly assosciated with the Morris Commercial and CMP gun tractors used to pull the 25 pounder with that little ammunition trailer in between, hence;
'Quad,limber,and 25pounder'
I would imagine the Canadian Army would also have used the term on anything like a C8A, for example.
Gordon
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