Just thought I would add this in case anyone else ran into the problem I did. All I wanted to know was if the trunk pop was a negative or positive pulse, but I was confused after reading the above comments. I went ahead and tested it and it works perfectly set up as a 5-wire (negative pulse). Refer to the top illustration in this diagram:
http://64.85.6.129/extrainfo/diagrams/26500_LEGACY_5-WIRE%20TRUNK%20RELEASE%20DIAGRAM.pdf