Around the Bend (2005) on Netflix

In Los Angeles, Jason Lair is recently separated, living with his grandfather and his son. He's a banker, tense, with a limp. Grandfather Henry, an archaeologist, wants to take the family van on a trip to Albuquerque. His plans are interrupted when Turner, Jason's father and Henry's son, appears after years of absence. Henry wants to celebrate family, as does Zach, Jason's son; Jason is angry and distant, Turner seems detached and says he's got a bus to catch in the morning. This prompts Henry to put in place an elaborate plan that will send his "tribe" on that Volkswagen bus trip to New Mexico sorting out relationships and digging up a crippled family history.