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Rectangle model availability & Specifications Rectangle SIERRA 1500,Cab Type,Drivetrain,Box Length,Wheelbase,Max. GVWR1,Max. Payload2,Max. Conventional Trailering3,Max. Goos... 2026 gmc sierra 1500 1 Maximum Gross Vehicle Weight Rating (GVWR). When properly equipped; includes weight of vehicle, passengers, cargo a... 2025 GMC Sierra 1500 Pro shown. Rectangle