GMC Sierra 2500HD (2018) is 787 mm (30.98 inch) longer, 179 mm (7.05 inch) wider, 463 mm (18.23 inch) higher and has 1158 liters (40.89 ft3) bigger cargo space than Opel Insignia Sports Tourer (2020).
Opel Insignia Sports Tourer (2020) is 1004 kg (2,213 lbs) lighter than GMC Sierra 2500HD (2018).