| 2025 GMC Sierra 2500HD 4X4 AT4 4DR Crew Cab SB |
| Take on the toughest terrain in the 2025 GMC Sierra 2500HD AT4 - where brute strength meets premium capability. Built for those who demand more from every mile, the AT4 delivers high-performance power, advanced off-road engineering, and a cabin crafted for elevated comfort. This is heavy-duty confidence, redefined. |
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