I'm not trying to ram anything down peoples throats and nor do I care the exact number built. It's just my opinion based on my life, my observations and printed history. Only commented because the question was raised for opinions. Quite happy to hear whatever anyone else has to put forward.

If you were or are into Vanning you will know of "Custom Vans & Trucks" magazine. I have every edition and started reading them from very early release and then purchased the earlier editions via back order. Anyway the point is if you have read it/them, so many of the Vans featured will tell you they started with a HJ/X/Z Sandman and built whatever it was turned into in CV&T. This magazine ran for over a decade at the height of Vanning. Super rare to read of a HQ Sandman at all. Either in factory form, in use, on show, spotto, readers rigs or featured Van. The same is the opposite for HJ/X/Z nearly every edition you'll find some mention. Must dig out my "Van Action" magazines and see if they ever seen any HQ Sandman action!