[Lobstah]

Well...the radio is in, and working. There is no seperate feed for the Class 2 data. It comes in over the orange power wires to the chassis.
If you look at the plug, there are 11 wires. 8 are speakers, one is ground, and the two orange are power and accessory (keep memory alive).

So the decision was between running seperate power wires to the fuse box and doing without the safety chimes (swapping the old radio back in once a year for inspection time) or paying the dealer to reprogram the truck's BCM. This requires a Tech II programmer.
Turns out the radio I installed (from a Tahoe) was never a "legal" option on this truck, so we had to try a couple of different things before we ended up with the right option codes to make it work.

Final bill from the dealer: $36.25
Took about a half hour. Would have been done sooner, but had to do it twice to get the right option codes.

Lob