GMC Sierra 2500HD (2020) is 642 mm (25.28 inch) longer, 158 mm (6.22 inch) wider, 205 mm (8.07 inch) higher and has 567 liters (20.02 ft3) bigger cargo space than Mercedes X-Class (2018).
Mercedes X-Class (2018) is 611 kg (1,347 lbs) lighter than GMC Sierra 2500HD (2020).