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Rectangle model availability & Specifications Rectangle 1 Requires 6.6L V8 gas engine. These maximum payload ratings are intended for comparison purposes only. Before you bu... 3500 Heavy Duty Chassis Cab,Cab Type,Drivetrain,Cable to Axle,Wheelbase,Max. Payload1,Max. GVWR2,Max. GCWR3,Max. GAWR... 2025 gmc sierra 3500 heavy duty chassis cab 2025 GMC Sierra 3500 Heavy Duty Chassis Cab shown. Rectangle