GMC Sierra 2500HD (2016) is 1030 mm (40.55 inch) longer, 104 mm (4.09 inch) wider, 7 mm (0.28 inch) higher and has 1051 liters (37.12 ft3) bigger cargo space than Mercedes G-Class (2018).
Mercedes G-Class (2018) is 495 kg (1,091 lbs) lighter than GMC Sierra 2500HD (2016).