FIAT 500X (2016) is 1320 kg (2,910 lbs) lighter than GMC Sierra 3500HD (2018).
GMC Sierra 3500HD (2018) is 1451 mm (57.13 inch) longer, 239 mm (9.41 inch) wider, 377 mm (14.84 inch) higher and has 1641 liters (57.95 ft3) bigger cargo space than FIAT 500X (2016).