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Rectangle 2025 highlights key standard features SAFETY + SECURITY Embedded OnStar® hardware, includes 8 years of OnStar Fleet Basics4 HD Rear Vision Camera5 with pic... 1 Premium paint; additional charge. 2 Requires 3500 Regular Cab 2WD DRW with 6.6L Duramax® Turbo Diesel V8 engine wit... 2025 GMC Sierra 2500 Heavy Duty AT4 Crew Cab shown. ,Downpour Metallic1 ,,Onyx Black1,,Sterling Metallic1,,Summit White,,Thunderstorm Gray1,,,,Titanium Rush Metall... NOTE: Exterior colors vary by trim level. See Order Guide for details. Rectangle AVAILABLE 36,000 LBS. Max. Gooseneck Trailering2 available models exterior colors 10 SPEED Standard Allison® Transmission AVAILABLE 7,290 LBS. Max. Payload3 Rectangle Rectangle Sierra 2500 Heavy Duty Pro 2WD or 4WD 1SA SLE 2WD or 4WD 3SA SLT 2WD or 4WD 4SA AT4 4WD 4SB AT4X 4WD 4SG Denali 4WD 5...
 
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Features based on 2500 Heavy Duty Pro 2WD model with 1SA equipment group. gmc sierra 2500 heavy duty/3500 Heavy duty Rectangle