Polar Industries goes for the record books, sending driver Todd on a risky run to deliver the heaviest haul in company history. But will the weight prove to be too much on a tenuous ice crossing. Art's sent on a high stakes rescue mission, and finds the job is more than he bargained for. Lisa lands an exclusive contract over one of the wildest trails in Canada. And Darrell steals a load from Polar, leading to a clash between him and Mark.