to your Euro Truck Simulator 2 "mod" folder (usually found in Documents/Euro Truck Simulator 2/mod ).
the mod in the game's Mod Manager before loading your profile. SCS TRAILER TUNING PACK V1.8.6 1.44
the .scs mod file from a reputable ETS2 modding community site. to your Euro Truck Simulator 2 "mod" folder
in-game with an owned SCS trailer to begin applying the new tuning parts. Important Note SCS TRAILER TUNING PACK V1.8.6 1.44