2025 At4x Hd. I have a 2025 2500 diesel at4x aev edition and a week into ownership the tailgate started to open while parked. 2025 gmc sierra hd at4x & at4x aev edition specifications.

The 2025 sierra hd at4x is rated to tow up to 18,500 pounds. Fully loaded with every option available (except the kicker tailgate setup, as i am building my.