I just installed the Hidden Hitch that I bought from Etrailer. It is very easy to install and still retains the skid plate. Here's how to do it:
1. Remove the three 13mm bolts holding the skid plate on and remove the skid plate.
2. Hang the U-shaped bolt through the tow hook.
3. Since I didn't have a helper handy, I propped the forward edge of the hitch up on 2 4x4s and used a jack to prop up the other end so I could line up the the U bolt with the receiving holes for it on the hitch.
4. Put the washers and nuts on the U bolt loosely and then line up the forward part of the hitch with the holes on the car body that the skid plate was attached to.
5. Then just use the supplied bolts to reattch the skidplate and hitch at the same time. Torque all the bolts down and you're done.
That's it. Great product, perfect "fit", easy install. I'll post another pic when I get my bike rack installed.