If you are looking for free trucking experiences on PC, you have several safe options:
The official Euro Truck Simulator 2 demo on Steam is not time-limited. You can drive around a restricted area (parts of Germany and the UK) indefinitely. You can install mods on the demo too! Euro Truck Simulator 3 Pc Free Download
To be clear, Euro Truck Simulator 3 has not been officially released If you are looking for free trucking experiences
There will be no Euro Truck Simulator 3 (at least for a few years) Euro Truck Simulator 3 Pc Free Download
The studio is currently focused on bringing ETS2 and American Truck Simulator to consoles.