i needed to add this to the "ModuleManager_WheelSounds.cfg" to make the folding wheels from the DLC work:
@PART[roverWheelM1-F]
{
MODULE
{
name = WheelSounds
wheelSoundVolume = 1
wheelSoundPitch = 0.5
wheelSoundFile = WheelSounds/Sounds/KerbalMotionTR-2L
skidSoundVolume = 0
skidSoundPitch = 1
skidSoundFile = WheelSounds/Sounds/gravelSkid
damageSoundVolume = 1
damageSoundFile = WheelSounds/Sounds/wheelDamage
soundInVacuum = false
}