FIAT 500X (2016) is 1308 kg (2,884 lbs) lighter than GMC Sierra 3500HD (2015).
GMC Sierra 3500HD (2015) is 1452 mm (57.17 inch) longer, 239 mm (9.41 inch) wider, 351 mm (13.82 inch) higher and has 1641 liters (57.95 ft3) bigger cargo space than FIAT 500X (2016).