I couldn't post pictures yesterday because my card reader wasn't working.
So here are (belated) pictures.
This picture best shows the screw that keeps the ski rack on. As you can see it is covered by a black piece of plastic. I can not get the plastic to move, but I think that is key in removing the rack. Also note the screw on the far side, the plastic covering is angled up, and not flat like the one in the foreground. It still doesn't move.
Another angle of the same thing.
The other side of the rack.
Here's a shot with the ski rack open. I couldn't see anything in there to release the rack.