Just traded my 1500 for a 2011 Chevy 2500, with tow package (tow mirrors and brake controller). I do not have owner manuals yet do the factory brake controllers work the same as my P3 controller?
Nice upgrade. Be aware 2011 models (1st year for DEF) had a few gremlins most notably bad NOx sensors, TCM (Transmission Control Modules) and DEF tank sensors that would go out. All were revised in 2012 and I believe GM extended warranty for 2011 owners on these components.
Duramaxforum.com is a great resource for information on your truck