Go Rhino RB20.. finish wearing off

I did a quick search but didn't see anything, so my apologies if there's a thread already.

As you can see in this picture, edge is starting to show metal. They've been on the truck since 2017.

What would be the best way to refinish these back to a "new" look. Would I need to sand them before hand?

Thanks in advance.

 

If it were me, I would just bedline them with a high quality bedliner, like Line-X or Bullet Liner and be done with it.

 

I have the same ones Rino lined and they still look good but faded get them sprayed with bed liner.