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 1431 liters (50.54 ft3) bigger cargo space than Opel Insignia Sports Tourer (2014).
Opel Insignia Sports Tourer (2014) is 1114 kg (2,456 lbs) lighter than GMC Sierra 3500HD (2017).