My real estate agency (well the one I have used most recently) saw my Overlander and recognised it as an Ambulance pack. He was a surfie-vanner in the 70's and bought a HZ Ambulance pack van, I think he said V8 manual. He bought it as Sandmans were hard to get, expensive to insure and the Ambulances were ex stock so a deal could be had.
My bricklayer bought a HZ tonner Ambulance too, 4.2L 4spd with U17 instruments, he knew exactly what it was as well. It seems Ambulance packs were well known of in the 70's but the world moved on and people forgot about them.
I've only ever seen 1 x HJ Ambulance pack though, but at the time didn't realise what it was. It was a white tonner, wrecked out in a wrecking yard, tagged as L31 M41. I can't recall a HX Ambulance in my memory but lots of HZ's - I guess the HZ's stood out as they had RTS badges on the guards and I just assumed the HJ and HX's had been later fitted with Premier noses but years later figured out what they were.