We always emphasize that the opinion of our customers counts. After all, customers are the ones who use the product and know what a particular product is missing. The result of us taking into account our customers wishes are also the SX Wheels, which we sell separately, but are compatible with all SX structures. They are designed to make the SX Racks easier to move, and because they are mounted on the side, you dont have to worry about the stability of the racks. Just slightly tilt the structure and you can already move it around the gym.