Many have what we call the "Tone" hitch. It is much lower profile, slightly recessed design. It requires cutting the rear cladding. Here's a thread that shows a few types.
I just bought the hitch that Tom4Bren mentions in post #69. Getting it installed soon. http://www.vehicross.info/forums/showthread.php?t=15541
It has 6 bolts that attach the hitch to the fram. It is very high quality. 2 of the holes are pre drilled they hold the tow hooks 4 holes need to be drilled.