Grave Diggers -- Stone Trailer

Australias Easy Rider combines counterculture, conspiracy and wild action, and pioneered a tradition of 70s exploitation films that peaked with Mad Max. Writer, producer and director Sandy Harbutt also stars as Grave Diggers biker gang kingpin, The Undertaker, a fierce Vietnam vet whose Hells Angels-like mob of denim clad outlaws are embroiled in a deadly conspiracy when a member (a drug-addled Hugh Keays-Byrne, the evil Toecutter in Mad Max) witnesses a political assassination. When the Grave Diggers also become targets, undercover cop Stone (of the title) embeds himself in the gang and tries to hunt down the killer.