ULPT Request: making road ragers stop following you

Just got followed for the third time in this city yesterday, guy was weaving in and out of traffic to follow me and tailgate + brake check me. This happens every couple years, and the police have explicitly told me they don't care unless someone actually hurts/kills me, even if I have it on video. I need some advice on what kind of gün/projectile launcher/james bond shit I should rig up so that I don't become a statistic.

Before someone comes up with the amazing idea of "don't engage", I don't. That's what pisses them off, is that I just record and don't react. I will be shot dead by someone in this shithole if I don't protect myself.