About This RV Jack Stands: These trailer support stands stabilize and level your RV; designed to provide RV positioning and stability Our RV stabilizer jacks can be extended from 11 inches to 17 inches, making them perfect for lower to the ground rigs. Durable Construction: The RV stabilizer jacks are made from durable cast aluminum; each stabilizer jack can support up to 6,000 lbs Simply place the RV jack stand in the corner of the trailer frame to achieve a stable, swing-free experience. We recommend using wood or concrete blocks under the RV jack stand for added stability. WINMAX makes quality products for RVing, boating, camping, towing, tailgating, and grilling that help take your passion for the outdoors to the next level Overview Vehicle Service Type : RV Material : Aluminum Load Capacity : 6E+3 Pounds Maximum Lifting Height : 17 Inches Brand : WINMAX TOOLS AUTOMOTIVE