Your best bet is to use a head unit that has the XM capability integrated into it. I believe the newer goldwings have actual car radio slots. right? Just go down to walmart and pick up one for less than $130. Then call up XM and get it activated.
If not that, then I'd suggest stearing clear of the Roady2 (or Roady) for that matter. There is no rugged or low-profile way to attached it to your bike, and still have it be removable. So, my suggestion would be to get the latest "neck wearable" receiver. It's on their website. Not the cheapest thing, but you can jack in your communications (rider to rider headsets) with much ease... Then carry it into work also. You'll have to figure out the user controllability (with gloves on) for those longer cold drives.
I do not yet know what antenna the wearble pice has, and if it's reception is good in the hills of the smokie mountains.
BTW, what goldwing club? My folks where in one for north AL, and they took trips into TN often.