installing trailer hitch on C5 A6

[Lee Levitt]

Has anyone installed a trailer hitch on a C5 A6? I found one brand, Curtis,
which requires a series of holes to be drilled with the hitch essentially
mounted to the spare tire well.
 
The last time I installed a hitch (on a Volvo 145 wagon), the frame was
pretapped for the hitch and the hitch mounted solidly to the frame...
 
Thoughts?

Anyone have a spare hitch for a C5 wagon?
 

Lee