>>96744512
>I'm scratching my head for an appropriate existing cinematic trait to go with this
Honestly, I could see Weapon Master (Vehicle) being a thing. Halves dodge penalties and adds +2/die to Slam damage at high relative skill. I'd add that it should also halve penalties for Rapid Strike, but can you even Rapid Strike with a vehicle? Does multiple Slams in a turn (if you overrun all your targets) count as a Rapid Strike? Actually, I think "Trampling" is something that vehicles can do to, which allows a Rapid Strike, if you interpret spinning in place directly on top of an enemy as "Trampling".