GMC Sierra 1500 (2014) is 552 mm (21.73 inch) longer, 101 mm (3.98 inch) wider, 478 kg (1,054 lbs) lighter and has 1061 liters (37.47 ft3) bigger cargo space than Mercedes G-Class (2018).
Mercedes G-Class (2018) is 102 mm (4.02 inch) higher than GMC Sierra 1500 (2014).