One unknotted rope thru a thwart can allow the boat to slide around, a prudently placed knot limits that.
I also do one thing that I haven't seen anyone else do, but it's great for peace of mind. I run a regular strap (tightly) around at least one of the rack crossbars and a thwart of the canoe - it seems that at least one thwart ends up on top of a cross bar usually. That is after the rest of the tie downs are done.
In high enough winds I could lose the skin off the canoe because it is a very light layup. But it is unlikely that the whole superstructure would go flying down the road.
Hardshell Kayak Sail Rigs
4-place Boat Trailer
The Kayak Wing
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