checkmate99

So that means I'll lose puddle lights and dimming, but gain cargo lights and those front marker lights.... is that correct, Phil?

I was reluctant to ask another question about these mirrors as there are so many already, but here goes! We are going cross country in August, and to Alaska in 2018 towing our 36 foot 5th wheel. I have a 2015 Chevy 2500HD LTZ CC 4WD gasser. I have the small mirrors, DL3 that have heat, power adjust, power fold, memory, auto dim, in glass turn signals, puddle lamps, and reverse tilt. I must have trailer towing mirrors before I make these long distance trips. The question (finally!) is, can I buy GM mirrors that will be plug and play, without changing the wiring harnesses? I know there is an additional hole required. Will I need to have the computer control flashed? Thanks for listening.... any help is appreciated!