Race with the Devil

The name of this movie is Race with the Devil released in 1975-06-01 and it's main theme is For old friends Roger Peter Fonda and Frank Warren Oates and their wives Lara Parker of Dark Shadows and Loretta Swit of M*A*S*H, it was supposed to be the best damn vacation they ever had. But their RV road trip takes a deadly detour at a secluded campsite when they accidentally witness a Satanic orgy and brutal human sacrifice. Now horror hits the highway as the couples are chased by blood-crazed cultists through some of the most intense crash-and-burn mayhem of the decade and into one of the greatest twist endings in drive-in history..