All those are great numbers, but I think that most of the straps will take more than advertised. If you look at ker mantle rope for example. Much of it's working weight is 1/15 of its load max weight. It is made of the same stuff. These straps are a ton bigger. I think if you just get a good set up, I would not worry to much about the numbers. Also when you are figuring that, you are not pulling dead weight. Your truck is on wheels...that changes a lot.