Install wiring harness for trailer '03 Jetta

I just bought a [FONT=verdana,arial,helvetica]hidden hitch wiring harness (4-Pole Hardwire Kit with Converter) from etrailer.com.
I was wondering if anyone has installed one of these in a 2003 Jetta TDI.

I just found these two links:
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http://forums.tdiclub.com/showthread.php?t=143774&highlight=modulite+install+trailer+hitch
Wiring Colors:
http://forums.tdiclub.com/showthread.php?t=182410&highlight=modulite+install+trailer+hitch
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They seem like perfect instructions, but can someone weigh in and say whether those are the instructions I want to follow or not...
Thanks

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