IberFrio Reefer Unit Sound v1.1 (ETS2)

Adds a realistic humming and engine‑start soundtrack to refrigerated trailers. The mod works with the SCS reefer, Schmitz S.KO Cool, Krone Cool Liner, Kögel Cool, Schwarzmüller and Tirsan SRI units. When you couple a trailer you hear a short beep followed by the unit’s engine start; the sound fades out as soon as you uncouple. It also kicks in automatically after loading a save with a reefer already attached, so you don’t have to re‑couple. Traffic‑bound reefer trailers emit a low‑volume hum when they’re close, quieter inside the cab than outside. Adjust the level via Options → Audio → Trailer Noise. The mod plays nicely with the Sound Fixes Pack (just place it higher in the load order) and you should disable any other “Reefer trailer sound” addons to avoid conflicts. Updated for game version 1.61.x with smoother hum continuity, a softer start beep, and better cabin‑vs‑exterior balance.