GMC Sierra 3500HD (2015) is 1283 mm (50.51 inch) longer, 231 mm (9.09 inch) wider, 457 mm (17.99 inch) higher and has 1570 liters (55.44 ft3) bigger cargo space than Mercedes GLA-Class (2015).
Mercedes GLA-Class (2015) is 1308 kg (2,884 lbs) lighter than GMC Sierra 3500HD (2015).