GMC Sierra 3500HD (2017) is 786 mm (30.94 inch) longer, 179 mm (7.05 inch) wider, 464 mm (18.27 inch) higher and has 1451 liters (51.24 ft3) bigger cargo space than Opel Insignia Country Tourer (2014).
Opel Insignia Country Tourer (2014) is 1114 kg (2,456 lbs) lighter than GMC Sierra 3500HD (2017).