World of Trucks games have great integration for radio streams, GGRadio is not a default station on American Truck Simulator or Euro Truck Simulator 2 when you press "Update From Internet" (yet!), so for now this is how you can add GGRadio to your games radio.
The process is the same for Euro Truck Simulator 2 and American Truck Simulator, however may differ in some cases. If you have any issues then post in Suggestions & Questions and we'll help get you sorted.
Open the Euro Truck Simulator 2 or American Truck Simulator folder
Windows: Windows: C:\Users\NAME\Documents\
OSX: ~/Library/Application Support/Euro Truck Simulator 2
Use a text editor to open the live_streams.sii file
Add the code above to the file, see the files format to place the code or see this guide
, if you need more help please post on the support thread.