GMC Sierra 2500HD (2018) is 1044 mm (41.10 inch) longer, 145 mm (5.71 inch) wider, 317 mm (12.48 inch) higher and has 1368 liters (48.31 ft3) bigger cargo space than Mercedes GLC-Class (2016).
Mercedes GLC-Class (2016) is 504 kg (1,111 lbs) lighter than GMC Sierra 2500HD (2018).