Fan Casting From Dusk till dawn (1976)

On the run from a bank robbery that left several police officers dead, Seth Gecko, and his paranoid, loose-cannon brother, Richard,, hightail it to the Mexican border. Kidnapping preacher Jacob Fuller and his kids, the criminals sneak across the border in the family's RV and hole up in a topless bar. Unfortunately, the bar also happens to be home base for a gang of vampires, and the brothers and their hostages have to fight their way out.