GMC Sierra 3500HD (2020) is 1690 mm (66.54 inch) longer, 296 mm (11.65 inch) wider, 597 mm (23.50 inch) higher and has 1629 liters (57.53 ft3) bigger cargo space than Mercedes A-Class (2019).
Mercedes A-Class (2019) is 1374 kg (3,029 lbs) lighter than GMC Sierra 3500HD (2020).