How bad would this sway? It seems like a good solution since so many of today's roofs are really too curved for canoe. Or hard to fit luggage box and canoe. Could probably find one of these for both canoe and a kayak and box. Put bikes on roof rack?
Another guy's sailing canoe with outrigger. Did a great job making the floats. Would like to do something similar. The jib sail looks nice but if you're going to have a second sail on a canoe, I think a small mizzen aft would give the boat better balance - especially upwind.