Sanwa Supply Foldable Tripod with Parallel Supports Slide and Dolly Photography DG-CAM31 Casters, Movement,

This is a tripod stand with casters that can be attached to your existing tripod later. It's easy to install; just place the tripod on it and secure it with screws. The tripod can be easily moved when you need to make a small change to the shot. The casters have stoppers, so you can easily lock and unlock them by simply stepping on them with your feet. It is foldable and can be stored compactly, making it very convenient to carry around.