Heading out on the Peak TV highway tonight, Audience’s comedy Hit the Road starring and co-created by Jason Alexander really goes nowhere fast. Premiering with the more promising 12-step-based Loudermilk on the AT&T-owned network, the self-described "not a family show" comedy about a family band of wannabe stars has a postcoital dead rock star, a stinky bus, sketchy stereotypes, parenting issues and supposedly talented siblings but not really much drama or laughs, as I…