I just bought a 2008 Silverado 2500 Diesel, Crew Cab, Long Bed, 2WD... and it's got a "pre-wire" for a brake controller located on the bottom of the dash to the left of the steering wheel. Yes it's got the tow package.
I just got my Prodigy model 90185 controller from Camping World today.
So this isn't going to be a "just plug it in and adjust it thing?" AARGH! I shoulda known when there was a miniature DVD in the Prodigy package.
I'm going to read all the instructions, play the DVD, read the owners manual and then probably call one of "youse guys" to help me do the actual install.