Key features Helps Reduce RV Rocking & Camper Bounce: Designed to help reduce side-to-side sway, floor bounce, and movement inside a parked RV, travel trailer, or camper. Use after your RV is already parked and leveled for steadier walking, cooking, sleeping, and campsite living. Measure First: Adjustable 11"–17" Height: Each aluminum stack jack adjusts from 11 inches to 17 inches with a smooth screw-style T-handle. Best for lower-clearance travel trailers, pop-up campers, small campers, and some 5th wheels. Measure frame-to-ground clearance before purchase 7500 lbs Rated Capacity Per Jack: Heavy-duty aluminum construction supports up to 7500 lbs per jack for stabilizing parked RVs and trailers. For stabilization only —RV jacks & stabilizers not for lifting, tire changes, or replacing leveling blocks, ramps, hydraulic jacks, or built-in leveling systems Tool-Free Campsite Setup: Simple T-handle adjustment makes setup quick without power tools. Place the jacks under solid frame contact points, adjust until snug, and avoid over-cranking. Use wood blocks, jack pads, or base plates on grass, dirt, gravel, hot asphalt, or uneven ground Complete 4-Pack with Rubber Pads: Includes 4 stackable RV stabilizer jacks and rubber pads to help reduce metal-to-frame contact noise. Compact design stores easily in an RV compartment, truck bed, or garage. Ideal for weekend campers, seasonal RVers, driveway parking, and storage use Free shipping included. 30-day hassle-free returns.