Best Friends (1975)

Mature, stable Jesse (Richard Hatch of Battlestar Galactica fame), his nutty and impulsive longtime best friend Pat (Doug Chapin), Jesse’s caring fiancé Kathy (Susanne Benton), and Pat’s fragile gal pal Jo Ella (Ann Noland) all decide to embark on a cross country road trip in a Winnebago prior to facing the challenges of encroaching adulthood. Relationships between everyone become increasingly strained as things take a turn for the worse and the journey turns into a severely bum trip for everyone involved.