Iraq War Veteran

[Bookie27]

Not sure if I've asked this one already.  Guy is living in a trailer with Wife, two sons, and daughter.  Wife is hiding money from him...rags on him all the time.  Believe he was working at a gas station and got fired.  Anyway, kills wife in trailer, and two sons who are outside playing.  Almost kills his daughter too, but takes her and hits the road, ending up in a small town working in a restaurant.  Not sure if all of this was a dream to him.

What's the name of the movie?