GMC Sierra 1500 (2014) is 357 mm (14.06 inch) longer, 155 mm (6.10 inch) wider, 147 mm (5.79 inch) higher and has 664 liters (23.45 ft3) bigger cargo space than Subaru Tribeca (2018).
Subaru Tribeca (2018) is 79 kg (174 lbs) lighter than GMC Sierra 1500 (2014).