The different carabiners we tested on a tensile breaking machine all broke right along their listed weight. The ones that said 31 kN broke around 7000 lbs (although they were drop tested first). I have never tested one on its minor axis or on a cross load but I would assume the manufacturer specs are pretty close to accurate. As far as generated force different saddles, different fall factors, different ropes, and different weighted people would all effect the forces generated in a fall. While no one can guarantee what force would actually be produced on the carabiner, I can assure you it is possible for a 200 lbs man to generate more than 8 kn (minor axis rating) in a fall. But that is why this is an at your own risk activity. Big brother isn’t going into the woods to be certain the right safety equipment is being used. By the way, nice car!!!