Investigating deadly truck accidents and the fight over measures that could save lives.

America's Dangerous Trucks

FRONTLINE investigates the lives and views of Sen. JD Vance and Gov. Tim Walz as they run for vice president. Drawing on interviews with those who know Vance and Walz well — friends, advisors, journalists and political insiders — the documentary traces how these two men from the middle of America found their opposing political voices and explores the ideas and influences they would bring to the White House.