GMC Sierra 3500HD (2014) is 1412 mm (55.59 inch) longer, 228 mm (8.98 inch) wider, 485 mm (19.09 inch) higher and has 1570 liters (55.44 ft3) bigger cargo space than Mercedes GLA-Class (2014).
Mercedes GLA-Class (2014) is 1224 kg (2,698 lbs) lighter than GMC Sierra 3500HD (2014).