I don't know if they prep it the same way as for the Georgetowns, but have a look up on the roof for a vent cap (mine are white plastic) just like the one usually found over/near the bathroom. There should be another one not associated with a bathroom, and is a fake for stowing the coax for satellite. Cable is usually found inside.......just unscrew the cap.
Ken and Terry
2010 Georgetown 330TS being pushed by our
2017 GMC Terrain toad (4 wheels down)