No experience with those.
I have been disappointed with my Yakima Gunnel brackets. My canoes tend to climb over those in strong winds.
Also the Yakima straps I have stretch more that the REI or NRS straps I have, making the boat(s)less secure.
When using the factory racks on my Rav4 I simply loop the strap around the side rail to prevent any side to side motion. That is much more effective than using gunnel brackets.
Free Standing Boat Racks
EZ-Dock modular docks
Paddler's Truck Rack
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