At a Glance: What it is: A frame of two long wooden poles, lashed into an elongated triangle, dragged behind a dog or horse to haul loads over land. The word comes from the French travail, meaning "to work." Nations associated: Plains nations including the Lakota (who called it hupak'in), Ojibwe (niswaakodaabaan), Siksika (Blackfoot), Assiniboine, Cheyenne, Salish, and Crow Materials: Wooden poles (aspen, cottonwood, willow), buffalo sinew lashings, rawhide, leather harnessin