Optimus Prime's second most common alternate mode is that of a fire truck. This works for a few reasons, namely because it visually still resembles his original semi-truck form. Likewise ...

Optimus' semi-truck form is also based on a real truck ... That Are Pure Nostalgia The original "Transformers" Optimus Prime toy was released in 1984, alongside the premiere of the Western ...

While Optimus Prime opens the film in the form of a rusted out 1973 Marmon cab-over truck, the autobot leader eventually takes the form of an awesome 2015 Western Star 5700-based semi. We'll see ...