Works on most surfaces and most trailer axlesround or square. From 10-15 wheels. To use, just place the jack under the axle and drive forward or reverse a few inches---Quick-Change automatically raises the trailer to the proper height for changing tires, lubricating or replacing wheel bearings, etc. Two-ton capacity, high strength aluminum construction. California Residents WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov Other Details Google Product Type Winches Jacks Wiser Yes Produc