This leveling scissor jack with 5,000-lb capacity each will keep your RV level and stable. Each adjusts from 4" to 30" inches as your situation requires, and the bow-tie base steadies the jack on soft surfaces. Features: Levels and stabilizes camper Remains steady on soft surfaces because of wide bow-tie base Bolts or welds on Includes 1 steel jack. Specs: Capacity: 5,000 lbs per jack (Min. breaking strength) Extended height: 30" Retracted height: 4" These stabilizer jacks are only used on RV/trailers for stabilizing and leveling purpose. Never use for lifting, changing tires or supporting weight of any vehicles, the vertical static load should never exceed 1/3 of the rating. Improper use can result in property damage, serious injury or death.