I just looked up the manual for the Malone stackers, and I don't see any way that "safety strap" setup wouldn't slide and come loose, unless it could be routed behind a cockpit coaming or other raised bit on the hull.
It seems like a completely superfluous "safety" feature anyway - perhaps put in by a lawyer or armchair lawyer with no engineering or paddling background :).
PFD's (Life Jackets)
Kayak & Canoe Outriggers
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