Step Stabilizers. Positioned underneath your bottom step, the Step Stabilizer takes the brunt of the weight so your stair supports don’t have to. This helps to alleviate bouncing and swaying of the RV while the steps are in use while also providing better security and balance for the user. Place one stabilizer directly under the middle of the bottom-most step platform or place two at opposite ends for best results. With a simple worm-screw drive, the 4" x 4" platform rises up underneath your steps by rotating one end of the stabilizer. All solid steel construction, the stabilizer boasts a range of 7.75" reach up to 13.5" and supports up to 750 lbs. The RV Step Stabilizer is intended for use on hard, level surfaces. Be aware that some units will have braces underneath their steps that may stop the Stair Stabilizer from properly contacting the bottom of the steps. Ensure the bottom of the step is flat before use. Be sure the Stabilizer is threaded at least a full three rotations beneath separating height for safest use.