[special-K]

I didn't realize the truck was for sale. That angle may have been added when new as part of the side bins set-up. Or, they were found to be necessary once the truck got used. That's a lot of weight to hang on sheet metal angles. The plates you see on the inside of the bedside were part of the side bin installation as well. If the wood is gone, that originally was there, then the angles were installed as part of the floor change. The factory angle strips would have aallowed for a 3/4" floor and now yours is what, 3/16"?

If you are keeping the side bins you'll have no need for the steps. Most installations eliminated those. Your truck is the only one I've seen with them left on. Is it the whole step or are they cut? I have had several sets of new take off steps and fenders from trucks that got this upfit when new.