I'm also on the hunt for a trailer hitch. etrailer.com shows two distinct designs for the X5; along with the normal attachment points the Draw-Tite and Hidden Hitch models have an additional 'leg' that connects to a cross member whereas the Curt unit only bolts up to the factory locations behind the bumper fascia.

I have yet to see what the factory hitch looks like but I'm leaning towards the extra support and towing capacity (6k# Vs. 5k#) of the Draw-Tite hitch even though the installation is a little more involved.

Comments?