FIAT 500X (2017) is 1254 kg (2,765 lbs) lighter than GMC Sierra 2500HD (2018).
GMC Sierra 2500HD (2018) is 1427 mm (56.18 inch) longer, 239 mm (9.41 inch) wider, 368 mm (14.49 inch) higher and has 1368 liters (48.31 ft3) bigger cargo space than FIAT 500X (2017).