Anyone else with an RST or the RST style running boards concerned about they will hold up over time? They are essentially molded plastic with a plastic/rubbery step surface. I have owned mine for less than a month and have already noticed that the surface will scratch easily just due to whatever might be on the bottom of your shoe (sand, gravel, etc.) while stepping into and out of the vehicle. Seems like a poor design for long term hold-up. I could see myself removing them down the road. Just wondering if anyone else has the same concerns with the design/style of these running boards.