That is Will Steger and team manhauling across the N. polar icecap. They used the canoes to cross leads as well as to carry all their gear and food. I have seen other examples on the web of polar trekkers using modified plastic kayaks as pulks for long trips. The modification was to open the hatch a bit to get their gear in and out. The kayaks were also used to cross leads in the ice. I guess it just depends on the scale and location of your outing.

Fjellpulken are the best pulks out there but they are extremely heavy for their size. I wouldn't want to hoist one on my back if the need arose. The Armadillo was nice and light but Kifaru stopped making them. They were way out of my $$ range anyway. I think a wood/glass composite could be made as light as the Armadillo. I've planned on trying this for a long time with cedar bender board, but just haven't gotten around to it. I don't think you would need to glass the inside, just epoxy it.