For owned trailers or unsupported third-party mods, the developer included a manual workaround via the menu: Navigate to Audio Settings .
: Fully supports base game trailers and specific DLC packs including Schwarzmüller , Krone (Cool Liner), TIRSAN (SRI), and Schmitz Cargobull (S.KO Cool). REEFER TRAILER SOUND ADDON V1.0.8 1.46
: Adds a constant engine hum that is audible both outside the trailer and from within the truck cabin. For owned trailers or unsupported third-party mods, the