Towing Mirrors on a new Silverado High Country or Denali

If the mirrors are electric, I would think you could go aftermarket and get some towing mirrors. I also wonder why you would get rid of a very useful, good towing vehicle and drop down to a lower towing capacity. Is it just getting old or are you having problems with it? You will lose quite a bit of towing capacity and fuel mileage dropping to a gasser from he diesel. You may make up for it in unloaded mileage but my Duramax gets between 18 and 19 mpg unloaded on the open highway at around 70 mph.