The Trailer-Hou (トレーラー砲 Torērā Hō, lit. "Trailer Cannon") is Kamen Rider Drive's rifle-like Shift Car weapon utilized when he assumes Type Formula, though he can also wield it as Type Tridoron. It first appears in episode 22. Like the Handle-Ken and Door-Ju, Shinnosuke names this weapon based on what it resembles: a semi truck, with the trailer section consisting a lot of its bulk. Similar to the Shift Cars and Signal Bikes, the Trailer-Hou is also sentient where it is powered by a specialized Core Driviar called the Core Driviar-TH (コア・ドライビア-ＴＨ Koa Doraibia-Tī Eichi).