Originally Posted by m.hony
I just drove the local GMC lot.
The mirror mount/sail panel area looks different on the Sierra and Yukon. The body lines/profile is different.
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Perhaps this might be a little extreme, but maybe the window/mirror mount could be replaced with one for the Sierra? Or not. I have no idea.
You could always trade the Yukon. People do trade very youthful vehicles for another one which may suit their needs/desires better. In fact, I recently did! I had a new 2015 Yukon Denali that I had owned for only about 5 months when I decided to trade it in on the 2015 Sierra Denali HD. But I didn't do it just for the mirrors. Payload had a LOT to do with it. Then there was the diesel puling power and engine braking. Lots of good reasons to do the switch given I would be pulling the 30 footer. Plus, I like nice trucks better than SUVs, so I didn't hesitate to do the swap. Yes, it cost a little money to do the swap, but now I have the truck that I want to tow the new 30' Serenity. Life is good.