GMC Sierra 2500HD (2018) is 1408 mm (55.43 inch) longer, 255 mm (10.04 inch) wider, 543 mm (21.38 inch) higher and has 1377 liters (48.63 ft3) bigger cargo space than Mercedes A-Class (2016).
Mercedes A-Class (2016) is 1209 kg (2,665 lbs) lighter than GMC Sierra 2500HD (2018).