Ensure your stabilizer stays steady on your tripod without requiring the use of a second tripod with this Aluminum Slider Support Rods two-pack from Neewer. The set includes two adjustable support rods, two ball heads, and two C-clamps. The setup supports a slider plus camera rig setup weighing up to 15.5 lb.
Each rod extends from 23.2 to 37.8" to allow for different slider lengths, and they mount onto the bottom of the slider using their 1/4"-20 screws on the top of the ball head mounts. The rods mount onto two legs of your tripod using the C-clamps, and they can clamp onto legs with up to a 2" diameter.