CMP 3ton tipper (canadian or Aussie)

[Barnaba]

Many thanks for these pictures: they'll be essential in making my model.
As written in one of the tables, it's a tipper n°3. Which are the differences between this and other versions?
I've seen that the rims are different from GMC CCKW ones: there are 8 smaller holes instread of 6 and the tyres are 8.25x20 instead of 7.50x20. Any idea of vehicles using similar wheels?

Through your images, I've tried to sketch the hoist works. It's the most complex tipping solution I've ever seen!!! Please correct me if I've not understood. The red circles show areas that I have imagined, but not seen in the pics. Please forgive me in advance for my bad English.

The jack is fixed horizontally (the rear is hinged to a bar) and it pushes something (I've not seen what it is) pulling the two U-shaped brackets. The next bracket is hinged to the same bar as the jack and turns around it. Then the other parts are obvious. Have I got it?
Who was the hoist made by? An australian make, or Heil or Gar Wood?

I'll be very grateful if you'd take some other shots of the body, in particular of the "red circled" areas, of frame of dumper and tray and of the hinge between the tray and the mainframe in the rear.
Thank you very much.