The Czech nationalized motoring concern, Motokov, were keen to export Tatra vehicles worldwide in order to raise hard currency. Tatra cars and some trucks were exported to English speaking countries. Canada, with its rugged environment was a targeted market.
Tatra continue to manufacture hardy trucks around the world. The Australian agency is Offroad Trucks in Perth, Western Australia - https://tatrat600.blogspot.com/2020/09/tatra-offroad-trucks-australia.html