Steve.
I went out and took more detailed pictures. No, I don't have gouges. The first two are the bottom of my bedroom slide on the street side. I'm thinking that is a bar just like the ones under my two living room slides. I believe that one is hydraulic, just like the living room. The third picture is a track at the bottom of my bedroom slide on the curb side. That one is a scissor slide and is definitely electric.
I'm sorry about the previous pictures. I'm tall, and I have two prosthetic hips, so bending underneath an extended slide is difficult.
I hope you find what's causing your gouging.
Stan