QUICK CHANGE TRAILER JACK (SPRINGFIELD MARINE)
More holding power and works easier than ever! Works on all surfaces and most trailer axles (round 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.