Not familiar with the G8 but on my TourMaster it required the removal of the wooden trim -- this TV is over the front steps and is a flat panel display. Here is a thread that also mentions other members' Scenic Cruiser coaches, etc.
http://www.gsowners.com/forums/showthread.php?t=2471
Maybe this will be of some help. If not, please post some pictures of your TV's location.
Chuck