Apart one reference at one Italian Online shop, heard no more news about 8063 (Tractor with trailer), or whether it is a real set or not.
Since I've got to know about this online reference today, I'm now confident again, it is real.
It was based on the Slurry Injection Tanker chassis, that we also have seen here at TBs some time ago.
See it in the images below,
...or just read the full model details and get the correspondent MLcad files, at Han's website.