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Highlights Polygon key standard features SAFETY + DRIVER ASSISTANCE + SECURITY Embedded OnStar® hardware, includes 8 years of OnStar Fleet Basics4 HD Rear Vis... 1 Premium paint; additional charge. 2 Requires 3500 Regular Cab 2WD DRW with 6.6L Duramax® Turbo Diesel V8 engine wit... 2026 GMC Sierra 2500 Heavy Duty Pro shown. ,Cardinal Red1,,Coastal Dune1 ,,Downpour Metallic1 ,,Glacier White Tricoat1,,Onyx Black1,,,,Sterling Metallic1,... NOTE: Exterior colors vary by trim level. See Order Guide for details. available models exterior colors Sierra 2500 Heavy Duty Pro 2WD or 4WD 1SA SLE 4WD 3SA SLT 4WD 4SA AT4 4WD 4SB AT4X 4WD 4SG Denali 4WD 5SA Denali Ulti... GraphicLine GraphicLine Features based on 2500 Heavy Duty Pro 2WD model with 1SA equipment group. GMC Sierra 2500 Heavy Duty/ 3500 Heavy Duty AVAILABLE 38,000 LBS. Max. Gooseneck Trailering2 STANDARD 10 SPEED Transmission AVAILABLE 6,970 LBS. Max. Payload3 GraphicLine GraphicLine 2027