This thread reminds me a lot of discussions at work. What is really being talked about is 'margin' - the difference between the point you are operating at and the point at which failure happens. Adding margin is expensive and inconvenient. And, it is hard to know exactly where these two points are. I don't like running out of margin so I get an oversized tow vehicle and pay the price in upfront cost and operating expenses. Of course, I could sell the trailer and guarantee myself that I'll never have a towing accident but that is not acceptable either. So far when bad things have happened, I have always had adequate margin and no one got hurt.
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