
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.

Dave is at odds again with his bosses; Maya faces freezing brake line issues; Hugh hauls 30 tons of boulders across Lake Winnipeg; Rick takes the sidelines with truck repairs; Tony and Lisa honor a fallen trucker.

Lisa and Maya help a stranded driver get back on the road; Tony gets a surprise from Carlile; Dave continues his descent into isolation; Hugh and Rick keep up their load count with backhauls; Alex deals with unstable freight.

A polar bear standoff at Prudhoe Bay ties up Carlile's loads at the most crucial time of the season; a veteran trucker's calculated risk puts his life and livelihood in jeopardy; one rookie's sent packing as the other picks up the slack.

Hugh and Rick come across an obstacle that could help Alex take the lead; Maya is dispatched in a convoy with Lisa for her first trip to the village of Nuiqsut; Tony deals with melting ice on the road; Dave boards an airplane destined for Alabama.