: New cabin spatial mixing and sound distribution for accessories allow for more realistic engine and interior sounds.

: Large-scale integrations like ProMods 2.51, which expand the game world across Eurasia. How To Install Mods in ETS2 with ALM (TruckersMP Friendly!)

: Cabin accessories like the SiSL Mega Pack and specialized trailer skins like the Schwarzmuller Pack .

: High-horsepower engine swaps (e.g., 750hp on any truck) and custom transmission edits.

: Official support for ownable low-loader trailers was added, which many mod packs now include as custom variants.

Version 1.39 introduced several base-game improvements that mods in these packs often leverage: