GMC Sierra 3500HD (2014) is 1419 mm (55.87 inch) longer, 198 mm (7.80 inch) wider, 368 mm (14.49 inch) higher and has 1556 liters (54.95 ft3) bigger cargo space than Mercedes GLA-Class (2017).
Mercedes GLA-Class (2017) is 1056 kg (2,328 lbs) lighter than GMC Sierra 3500HD (2014).