A little story about boards -

A few years back I bought new boards for my 5.8. It turned out they were from a bad production batch with the incorrect layup. The factory tried to recall them, but somehow these made it out to me.

My crew and I stood on them several times while righting the boat, no problem. But one day they snapped while making a quick manuver while sailing fast downwind.

So, that's annecdotal evidence that the loads on boards while sailing are far greater than two people standing on them while righting.