It's very confusing.
As far as I understand, the Ansett L5R name is used for two different trucks, one with the same cabin as the puzzle vehicle, and another one which is more modern.
Then I could find a Super Power L4, which has the same cabin as the puzzle vehicle, and a Shenli L4 which is older.
I reckon the puzzle vehicle is called L4R but I couldn't find any source which calls it Ansett L4 or Ansett L4R.
I can't find anything else so please unlock it.