If I have it right, you are talking about a strap that goes around both boats on a side of the stacker once they have been separately attached via straps to each stacker. Do I have this right?
If you have the outer boat separately attached to the stacker - which will likely take at least a couple of pairs of longer straps, and bowlines to all four kayaks, the belly strap should be optional. If the outer boat is only attached dependent on the inner one, I would suggest you change things so each boat is independently attached to the stackers and rails.
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