Goin' South (1978)

 

Directed by Jack Nicholson. Free with ads on Youtube. Mary Steenburgen, Christopher Lloyd, Danny DeVito, John Belushi, Ed Begley Jr. 

https://en.wikipedia.org/wiki/Goin%27_South

https://trailersfromhell.com/goin-south-4k/

http://every70smovie.blogspot.com/2013/08/goin-south-1979.html 

https://www.thespinningimage.co.uk/cultfilms/displaycultfilm.asp?reviewid=9812