Promised Land.

The film is about a former child star who still can't accept that his one film is likely to be the last he ever starred in. He drives around in a car that's one big ad for himself and occasionally makes the local news with some freak incident. When the film starts he has just burned down his trailer and caused a traffic jam. He then hits the road with a DV cam to capture real life. A friend promised him he could sell such material to an Italian TV station. When he meets a famous singer on the way and gets drawn into her story things get interesting.