Those d-rings should be welded, so they probably can take whatever you can throw at them.
My advice though, is to connect them to the d-ring on the OPPOSITE side of the boat from which you'll be boarding. It'll keep the d-ring at a better angle for stresses.
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Richard
Gluing geek since 2007
Opinions and intepretations expressed are solely my own and do not express the views or opinions of my employer
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