GMC Sierra 3500HD (2018) is 1104 mm (43.46 inch) longer, 239 mm (9.41 inch) wider, 245 mm (9.65 inch) higher and has 1099 liters (38.81 ft3) bigger cargo space than Subaru Forester (2015).
Subaru Forester (2015) is 1188 kg (2,619 lbs) lighter than GMC Sierra 3500HD (2018).