GMC Sierra 3500HD (2015) is 846 mm (33.31 inch) longer, 110 mm (4.33 inch) wider, 221 mm (8.70 inch) higher and has 1126 liters (39.76 ft3) bigger cargo space than Toyota Highlander (2017).
Toyota Highlander (2017) is 679 kg (1,497 lbs) lighter than GMC Sierra 3500HD (2015).