The Gladiator (1986)
starring Ken Wahl, Robert Culp, Nancey Allen
it was a made for tv movie
guy turns vigilante with a '70s or '80s chevy truck with a souped up motor, bunch of gadgets,and a grappling hook cannon in the bed. At the end of the movie he chases down a guy in a black dodge charger, 68 or 69 I think.