This is what we installed on our DX3
3 of Prest-O-Fit 2-0420 Ruggids RV Step Rug Black Granite 23 In. Wide
bought on amazon, work great fit good. use tywraps, not springs, addae extra.
Well I did it on the cheap. Dollar Tree had a floor mat(thin) dark gray in color, for a buck and it did 2 steps. Cut to fit and a dab of Goop in 5 spots and been on for 1 1/2 years and still look good and the grooves help keep my floor clean. They easily sweep clean and no slipping.
I think we bought the 23" ones so I went outside and took some photos.
I also got a pic of the back side so you can see how they are attached. We have had no problem with these step covers.