
Truckers with nerves of steel take their lives in their hands driving heavily loaded vehicles across frozen lakes to deliver supplies to remote locations in Canada and Alaska. Whether they're bringing supplies to Canadian diamond mines, supplying offshore oil rigs in Alaska or even charting new territory driving over frozen swamps and rivers to bring much-needed supplies to small towns, these extreme truckers face troubles from their machines and from Mother Nature.

Alex faces the biggest blizzard of the season; Darrell Ward raises the stakes in his rivalry with Jack Jessee; Porkchop struggles to climb Atigun Pass; Austin is sent out on a heavy haul special assignment.

Rick crashes into a superintendent of the road; Austin is given the toughest challenge of his Dalton career; Porkchop is sent to help Jack get a job done; Darrell Ward fights to stay warm when his truck dies.

Jack rushes to get out of town due to extreme temperatures on the oil fields; Darrell makes a risky decision on one of the Dalton's steepest inclines.

Alex hauls a dangerous load of deadly compressed gasses; Jack gets derailed by a torturous load; Austin meets a trucker stuck on Atigun Pass; Porkchop meets the boss to answer for his performance on the road.