GMC Sierra 3500HD (2014) is 1065 mm (41.93 inch) longer, 165 mm (6.50 inch) wider, 25 mm (0.98 inch) higher and has 1504 liters (53.11 ft3) bigger cargo space than Mercedes G-Class (2017).
Mercedes G-Class (2017) is 24 kg (53 lbs) lighter than GMC Sierra 3500HD (2014).