Thanks!

Does the WDS show any detail for accessories? I've found 61130412965 which is the connector for a 5 wire US light trailer, but it's hard to tell what the other end is. If it plugs into the harness, then there's my "kit" The pigtail and TCM should get me up and running. I'd love to have the complete factory setup, but I rarely haul more than 1000 lbs and I really can't wait for an OEM hitch to show up. If I can get something workable without hacking the wiring, It'll be reasonably easy to swap the hardware for a factory receiver if/when I manage to find one.

I'm guessing that the TCM tells the LCM to send power to the harness? Otherwise, it would seem rather pointless to have such a fancy/expensive module just to turn off the park sensors.

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'04 E53 X5 4.4i
'05 Mazdaspeed MX-5
'00 Saab 9-3 SE Cabrio