IberFrio Reefer Unit Sound v1.1

Realistic reefer unit hum and engine start sounds
Works with SCS reefer, Schmitz S.KO Cool, Krone Cool Liner, Kögel Cool, Schwarzmüller and Tirsan SRI trailers
Sound starts when coupling a reefer (short beep + unit engine start)
Sound stops when uncoupling
Sound plays immediately after loading a save with a reefer already attached
Reefer trailers in traffic also have the unit sound (quiet, only when close)
Quieter inside the cabin than outside
Volume controlled via Options → Audio → Trailer Noise slider
Compatible with Sound Fixes Pack (place this mod higher in the load order)
Disable any other “Reefer trailer sound addon” to avoid conflicts

Sound now plays right after loading a save with a reefer attached (no need to re-couple)
Added sound for reefer trailers in traffic
Improved continuity of the hum while driving
Quieter start beep
Better cabin vs exterior volume balance

Tested on game version 1.61.x