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I am making a ramps to load logs onto a portable sawmill. I would like to know the size steel tubing I need for logs weighing 4000 lbs. the ramps would be 8' long and at the following angles; never less than 25 degrees never more than 38 degrees. 1.5 x .125 tubing is available locally, but that does not seem to be big enough. Any help is appreciated.