GMC Sierra 1500 (2014) is 457 mm (17.99 inch) longer, 165 mm (6.50 inch) wider, 605 kg (1,334 lbs) lighter and has 1241 liters (43.83 ft3) bigger cargo space than Mercedes G-Class (2015).
Mercedes G-Class (2015) is 87 mm (3.43 inch) higher than GMC Sierra 1500 (2014).