I like rope. It stays put. Once I put my beloved OT Guide 18 from 1951 on a large canoe trailer. A friend volunteered to haul all of our canoes for a trip on the Colorado River on a commercial 8 place trailer he borrowed. You can be sure I tied it carefully before turning it loose for a 500 mile trip.
That is good advice. On our last big trip (3,400 miles r/t) I had 2 new Thule feet with me and I actually replaced an old one that looked like it was failing on the way home.
When we double up on bow and stern tiedowns, one goes vertically and one to the opposite corner. With normal transport and two kayaks, bow tiedowns go to opposite corners, pulling both kayaks slightly toward the center of the roof.
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