Hello Newbie. I have never had running boards except on a 40 Chevy I had as a kid back on a farm in CT. The removal of the running boards on a 99 Chevy truck I suspect will become very intuitive. You just need to crawl under there, get a little dirty, take a close look at what is holding them in place, and go for it. Have you tried this yet? I could be totally wrong, but I suspect it would be easy to remove them. The holes left behind should be treated to prevent corrosion - another story depending on what is left behind.
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