Keep your tandem-axle trailer steady and prevent unwanted shifts with the TowingMaster XX-Chock Stabilizer. with a new and improved design, this stabilizer works with your tires to keep your trailer steady when it is not in motion and fits more axles than its predecessor. Pivoting louvers grip the treads on tandem tires to prevent slipping, and heavy-gauge steel chocks apply non-harmful force to eliminate give. When you are loading or unloading your trailer, the last thing you want to worry about is unwanted movement. The TowingMaster XX-Chock Stabilizer can easily retract down to 1-3/8 in. and expand to 17-1/2 in., allowing it to seamlessly fit between the tires on most tandem-axle trailers and give you peace of mind. Your purchase includes two XX-Chock Stabilizers, one for each side of your trailer, and a plated ratchet wrench to easily install and secure the products. You can also use a power drill (not included) to make the installation process even easier. An instruction manual is included to guide you through the process. When you're ready to hit the road, it's easy to remove the stabilizers from your trailer. They are lightweight and compress down to 1-3/8 in., making them easy to carry and store in tight spaces. The TowingMaster XX-Chock Stabilizer is an excellent choice for RV trailers, as it helps keep the unit steady as you walk through it. with a durable design, it is built to be a part of your adventures well into the future. TowingMaster products are backed by a 1-year warranty.