It sounds like that is a lot of legal stuff with a big safty factor built in. That way when someone's 2000 lbs load breaks the strap and his load falls off of his truck, the company is not held liable.
Safety factors and equipment load rating are important. But the designers usually throw a safety factor on a product, then the legal types throw their safety factor on top of it.
Case in point I worked on a report for a 200,000 lbs load across a bridge rated much less. Everything came out fine.
Although I am not going to tell anyone to knowingly go over what a product is rated for. Each person needs to make their own choice on this one. I personally hang from places I do not want to fall from.
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