MAJOR SAFETY FEATURE Easily Lock the Jack at any height by adjusting the lock nut. Every year there are thousands of “car lifting related” accidents. Many of which are fatal. Most of these are from hydraulic failure. COMPATIBLITY Best for Cars, Vans, Trucks, Jeeps, and RV Campers. Can be used on its side or vertically. Easy Setup and take down in seconds. CAPACITY 3 Ton Bottle Jack with Safety Nut to Secure Loads (6000 Lbs Maximum Capacity), Heavy Duty Vehicle Jack, Can be Used Horizontally. HEIGHT Lift the nut off the housing, spin the nut up and you can lower the jack. Level your RV in less than 1 minute, it's a jack and jack stand all in one. SAFETY Easily Lock the Jack at any height by adjusting the lock nut. Also, its compact size adds additional safety unlike a bulky jack stand. The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked.