To reach Yukon and Alaska by road, travellers must drive through British Columbia. Most RVers take the Alaska Highway northward and the Cassiar Highway on their return south.
The Alaska Highway is a major route and well-maintained
The Cassiar is more remote with fewer services.
There is not much difference in the distance. The Cassiar route from Prince George to Whitehorse is only 210 km (130 miles) shorter than the Alaska Highway route from Prince George to Whitehorse.