standard stock mirrors for towing

Here's my suggestion. Buy towing mirrors. I had the extensions on my Yukon XL. They worked but not great. Had to put a strap around them to keep them on, they vibrated, and eventually one flew off going down the highway leaving a small crack in the front of my trailer.

http://www.am-autoparts.com/2009/Dodge/Ram-1500-Truck/side-view-mirrors.html