Our GT XL came with the XM box installed. Unfortunately the antenna was stuffed up under the dashboard which prevented the XM unit from activating properly. Had to run the antenna wire up to the roof and mount the antenna near the right front of the roof. Then everything worked great.
John & Gloria Hunsaker FROG Member CA-0030-988
2014 Georgetown XL 334QS (class A with 4 slides)
2013 Smart Car TOAD
Blue Ox Aventa LX tow bar, base plates, diode kit
SMI Stay-IN-Play Duo auxiliary braking system
25' Off shore blue water fishing boat