A highly durable track and anti-tip system allows for the movement of your Thinline 2000 units with ease in combinations which provide quick, convenient and safe access. The track adds only four inches to your units' height (plus the anti-tip) and easily spans even and uneven surfaces due to leveling domes which are leveled onto the floor. Doors can be installed at the time of purchase or later if the need arises. Thinline 2000 truly is considered an industry leader in flexibility and mobility!