I was told the way to check it was to raise your butt about an inch off the seat and shift your weight (throw your butt) to each side very quickly. I tried that and the bike seemed very unstable. I installed the "Missing Link" TWR and now the bike is like it's on rails.
The 2009 touring models have a different frame, different attachment of the swing arm, and an additional link (four instead of three). The Motor Company knew there was something wrong with the rubber mounted swing arm. Now, they've fixed it.