GMC Sierra 3500HD (2018) is 1282 mm (50.47 inch) longer, 231 mm (9.09 inch) wider, 483 mm (19.02 inch) higher and has 1570 liters (55.44 ft3) bigger cargo space than Mercedes GLA-Class (2015).
Mercedes GLA-Class (2015) is 1320 kg (2,910 lbs) lighter than GMC Sierra 3500HD (2018).