Thanks everyone. I really don't like the idea of it hanging out back where I can't see it anyway. I have a very expensive road bike ($5,000+). I had a fork mount that I put in the bed of my truck right against the cab, but I added an auxiliary fuel tank in the bed and that took my bike space.
The factory rack looks fairly robust and mounts to the frame rails and not the bumper. The frame doesn't extend as far on my 390 as in this pic though.
Looks like I go with my old option of putting it in the 5er. Keeps it out of the weather that way too.