When I was dealing with putting aluminum trim on the edges of the slides where the plywood was exposed, I also contacted Parkland Plastics for their repair kit which consisted of thick black plastic strips with PSA tape in it and some tubes of #105 sealant/adhesive. Not quite what I expected for the high price, but that's all it was. I put the strips on the bottoms of the three slides with black exposed edges where it looked like there was contact and used the remainder to cover the marks that the bedroom slide rollers were making on the white underside. Seems to have helped. There are small indentations where the rollers contact it while retracted, but I couldn't cover those spots because the large steel bolt heads (or whatever they are) were in the way.
So, if you put some kind of plastic or metal plate over those grooves, it should help prevent further wear. For a while, I think HL started putting some trim on the plywood floor edges, but then started using that black plastic tarp stuff. My neighbor at the CG with a newer Sundance has that on his slides and the bedroom floor is turning to mush. He's not happy.