My sister was driving a 2004 GMC Sierra 4x4 several years ago. A guy ran a stop sign and she T-Boned him going 55 mph. The truck flipped on its driver side into a cornfield. She was wearing her seatbelt, and the air bag deployed. She crawled out the passenger side window with a small scratch on her forehead. The truck was totaled as was the other vehicle. GM builds some awesome trucks. Glad that your wife was ok, but really I have seen more damage done to a vehicle from hitting a deer.
Was that in a parking lot? That is way less damage than when my wife slid on the ice puling into a parking spot and clipped a yellow concrete pole with our old '05 Ody. That was going < 5mph. I am surprised the airbags went off for minor fender damage.