GMC Sierra 3500HD (2017) is 935 mm (36.81 inch) longer, 168 mm (6.61 inch) wider, 23 mm (0.91 inch) higher and has 1504 liters (53.11 ft3) bigger cargo space than Mercedes G-Class (2016).
Mercedes G-Class (2016) is 119 kg (262 lbs) lighter than GMC Sierra 3500HD (2017).