Thanks for the pic Bigfoot. Yes those are the running boards I have. I also have the matching ones for the bed, in front of the duals. Makes getting stuff out of the bed easy.
Mine have no corrosion, but have suffered a scrape and a dent over the years. Still look pretty good though and if I have to, I will put them on the new truck. But, it is longer as the crew cab is larger in thr 2020s. Probably would look OK if centered when installing, but with the age, wear and tear, and size difference... I would like a suitable replacement.
I like the Duraflaps. They are not currently offering anything for the 2020 Duallys though. At least not in the no drill models.