The specific version you're searching for, Euro Truck Simulator 2 v1.46.2.2s
In the context of modern gaming, "portable" typically refers to software that runs without a formal installation process, often from a USB drive. While official "portable" versions are rare for major Steam-integrated titles like ETS2, the community often seeks these for convenience or to play on systems where they lack administrative privileges.
Mechanical Realism: The introduction of Driveshaft Torque—simulating the chassis spin and slight front-wheel lift during acceleration—added a layer of physical authenticity previously missing from the driving model.
: A physics improvement that simulates chassis twist during acceleration, causing the front-left wheel to slightly lift under heavy load. Map & World Updates Iberia DLC Expansion : Added a new explorable settlement in Arganda del Rey
Euro Truck Simulator 2’s v1.46 build set to expand Iberia DLC | Traxion