GMC Sierra 3500HD (2018) is 845 mm (33.27 inch) longer, 110 mm (4.33 inch) wider, 247 mm (9.72 inch) higher and has 1126 liters (39.76 ft3) bigger cargo space than Toyota Highlander (2018).
Toyota Highlander (2018) is 691 kg (1,523 lbs) lighter than GMC Sierra 3500HD (2018).