GMC Sierra 1500 (2018) is 76 mm (2.99 inch) wider, 44 mm (1.73 inch) higher, 455 kg (1,003 lbs) lighter and has 1373 liters (48.49 ft3) bigger cargo space than Mercedes GLS-Class (2021).
Mercedes GLS-Class (2021) is 114 mm (4.49 inch) longer than GMC Sierra 1500 (2018).