GMC Sierra 2500HD (2019) is 360 mm (14.17 inch) longer, 115 mm (4.53 inch) wider, 157 mm (6.18 inch) higher and has 567 liters (20.02 ft3) bigger cargo space than Mercedes X-Class (2018).
Mercedes X-Class (2018) is 593 kg (1,307 lbs) lighter than GMC Sierra 2500HD (2019).