GMC Sierra 3500HD (2020) is 1572 mm (61.89 inch) longer, 242 mm (9.53 inch) wider, 419 mm (16.50 inch) higher and has 1535 liters (54.21 ft3) bigger cargo space than Mercedes GLA-Class (2018).
Mercedes GLA-Class (2018) is 1206 kg (2,659 lbs) lighter than GMC Sierra 3500HD (2020).