The sidewalls, because of their small size, only have tubular aluminum around the structure of the sidewall as well as the windows, door and back cabinetry. We would advise using glue and ½” Screws to fasten items to the walls.

If you want to go above and beyond on that you could use a Drywall Anchor – They are very sturdy and can hold a lot of weight. The best part is you can use them anywhere on the sidewalls!