It unlocks parts across all brands, effectively allowing "the tuning of all trucks" as your title suggests.
Many users specifically search for the "backwall piece" from the mod, which was a major update for version 1.46. This "piece" allows for detailed interior and exterior back-of-cab customization for Scania and DAF trucks.
Open the game, go to the , and enable the mod to see the new parts in the upgrade shop. is uh thank you yes bye oh you. YouTube·BLADE1974 Euro Truck Simulator 2 - How To Install Mods
Bumper lips, roof bars, and the signature EKO backwall piece for Scania S/R and DAF 2021 models.
If you are looking for the mod that allows you to put (e.g., Scania lights on a Volvo), you are likely looking for a "Tuning All Truck" package.
Search for the "Tuning All Truck & Trailer Package 1.46" on platforms like ETS2Mods.lt or the Steam Workshop . How to Install the "Piece" Download the .scs file for the mod.