We're the Millers (2013)

Small-time pot dealer David learns the hard way that no good deed goes unpunished; trying to help some teens, he is jumped by thugs and loses his cash and stash. Now, David's in big debt to his supplier and to wipe the slate clean, he must go to Mexico to pick up the guy's latest shipment. To accomplish his mission, Dave devises a foolproof plan: He packs a fake family into a huge RV and heads south of the border for a wild weekend that is sure to end with a bang.