Mercedes-Benz LPS 2032 tractor with Hoyer tank semi-trailer
The trailer is too inclined, so that its front axle is not on the ground.
We note on the prototype that the headlights are embedded in the bumper, including indicators. Brekina simplified this with a white painted area!
Almost all three-axle tractor pictures, like this one, show the second axle with single-wheel, and steering (this last point is obviously visible only when the wheels are steered). In addition, but I can be wrong, I do not see the need for a three-axle tractor for a relatively light rank semi-trailer.
Made from 1969 after Diamond Tuning, and even much earlier (1963) — at least for the cab — according to the blog de magnum31gb, perhaps until 1976.
A Hoyer branded cab can be seen on page 67 of the baumaschinenbilder.de forum.