: Confirmed for the Freight Market and External Contracts.
For owned trailers or unsupported third-party mods, the developer included a manual workaround via the menu: Navigate to Audio Settings . REEFER TRAILER SOUND ADDON V1.0.8 1.46
To function correctly, this addon requires the to be active and set to a high priority in the Mod Manager. It relies on the trailer tire sound definitions to carry the reefer sound loop. Trailer Compatibility The mod is confirmed to work across various modes and DLCs: : Confirmed for the Freight Market and External Contracts
: On some road types that do not support trailer tire sounds, the reefer loop may stop. Driving briefly onto grass or gravel often restarts the loop. It relies on the trailer tire sound definitions
: Adds a constant engine hum that is audible both outside the trailer and from within the truck cabin.