Darius Goes West (2007)
Darius Goes West: The Roll of his Life is a documentary by Logan Smalley about Darius Weems, a teenager living with Duchenne muscular dystrophy who embarked during the Summer of 2005 on a 7,000 mile road trip across the United States to promote awareness of the fatal disease Duchenne muscular dystrophy, and to raise money for research into a cure.
More at Wikipedia.