GMC Sierra 3500HD (2017) is 1289 mm (50.75 inch) longer, 201 mm (7.91 inch) wider, 366 mm (14.41 inch) higher and has 1556 liters (54.95 ft3) bigger cargo space than Mercedes GLA-Class (2017).
Mercedes GLA-Class (2017) is 1151 kg (2,538 lbs) lighter than GMC Sierra 3500HD (2017).