Ford Flex (2016) is 224 mm (8.82 inch) wider and 890 kg (1,962 lbs) lighter than GMC Sierra 2500HD (2014).
GMC Sierra 2500HD (2014) is 590 mm (23.23 inch) longer, 243 mm (9.57 inch) higher and has 495 liters (17.48 ft3) bigger cargo space than Ford Flex (2016).