Wow, thanks for the pictures!
I'm interested to see that everyone has almost direct mounted the beds over the double cabs with no clearance. That might be my dream set up now that I have a dog and kid, though the smaller trucks always seemed so convenient.
I think this is more info on the brown Woelke truck (or something very like it:
https://www.woelcke.de/expeditionsmobile/fuso-canter-doka-4x4-2017.html
While all the factory trucks at the show had some sort of suspended subframe, (I would guess that when spending 200,000 to 2,000,000€, that is expected) at least 1/3 of the heavy iron trucks at the camping area had no suspended subframe. A rough guess as this was the camping area and there is a limit to walking into someone's tiny zone of camping space and sliding under their truck
You could tell a lot of these subframeless trucks had 'been there, done that' so I would venture to guess, on a heavy framed Mercedes, Man, Iveco, etc (not a Fuso or Unimog), it is not super critical.
The camping area was as, or more amazing than the show. 1000+ trucks, vans, you name it of every description, with unlimited cool ideas, parked as if a hyperactive 4-year-old had been told to put his Legos away, and was not happy.