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.
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. AZ Г–SSZES teherautГі TUNGOLГЃSA 1.46
It unlocks parts across all brands, effectively allowing "the tuning of all trucks" as your title suggests. If you are looking for the mod that allows you to put (e