I find the Suspenz to be pretty rugged. I use one cam strap each side, and don't go across canoe, just to thwarts front and back. Can't roll and friction seems to keep it from moving aftward or sternward.
I looked at homemade but they get awkward to portage when they can't be used.
I looked at homemade but they get awkward to portage when they can't be used.