Plastic step insert
Screws in my step insert were rusty, so I pulled them out to replace. During the process, I found that AS had missed caulking the mount toward the interior of the coach. So I silicone caulked all around the insert both from top and bottom. The interior edge did not rest on the floor as it should have, so I leveled it with black caulk so stepping on it would not break the plastic. If mine ever breaks up, I think I could fashion one out of aluminum diamond plate to replace the plastic. A good tape measure and make a cardboard mock-up would make it easier. My .02 worth.
A Man has got know his limitations-Dirty Harry
That's Some Bad Hat Harry-Jaws 1978