I took a pack frame and some 3/4" flat steel stock. Bent the steel stock into a squashed Z shape when viewed from the side, and coated the steel in a liquid rubber. One leg of the Z drops into the pack frame tube and the boat sits in the rest of the Z. Very comfortable. That boat only weighs 54lbs though.
It's a flatwater boat. (18' Wenonah Jensen) That picture was taken in the Quetico. I was paddling a Royalex Old Town Tripper with a fabric deck on the Nahnni. Don't think I'd paddle a Tripper on the Nahanni again. The upper section is very technical and rocky. Something like a Blue Hole Starburst, Old Town Appalachian or Esquif Canyon would be much better up there although the cargo capacity would be less.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13