This enormous SUV boats up to 3,429 litres of cargo space and never flies under the radar. It comes in one of two versions (1500 or 2500) and offers three engines (a 5.3L V8 for the 1500 and either a 6.0L V8 or 6.6L Duramax diesel for the 2500). Regardless of the trim level, there’s a six-speed automatic transmission – Allison for the Duramax. AWD is optional on the 1500 but factory-standard on the 2500.