Peterbilt begins production of its 567 Heritage sleeper this fall. Until then, here’s a detailed walk-around of the new truck. The Model 567 Heritage is configured with a 121-in. BBC and set-forward front axle (SFFA) – the industry’s most modern SFFA truck – to optimize payloads and weight distribution. It can be spec’d as a day cab or with a 72- or 80-in. sleeper.