Russ,
I have the same radio and it is a Visteon and Fleetwood uses River Park as their Audio/Video component source. Their web site is
River Park, Inc. National Distributor of Mobile Audio Products and you can download installation and user manuals. It is not an XM service but Siruis and to activate Sirius you need to find the remote sat receiver box that is plugged into the back of your Visteon radio and on the sat box is the receiver ID number. When I first got my motorhome I called Sirius, Ford customer relations, and each gave me a sequence of numbers on the radio dash that was supposed to give the radio ID but none worked. In frustation I finally called my dealer and he said "Oh, the number is on the bottom of the external sat receiver box." The box is approximately 5X4 inches and mine was attached with Velcro on the floor beneath the radio.