GMC Sierra 2500HD (2014) is 1305 mm (51.38 inch) longer, 198 mm (7.80 inch) wider, 358 mm (14.09 inch) higher and has 1283 liters (45.31 ft3) bigger cargo space than Mercedes GLA-Class (2017).
Mercedes GLA-Class (2017) is 1355 kg (2,987 lbs) lighter than GMC Sierra 2500HD (2014).