jacks provide a simple, and if correctly used, relatively safe way
to lift a vehicle prior to repair or maintenance.
Aside from fixed vehicle lifts trolley jacks are one of the largest
jacks used in automotive repair. Trolley jacks vary in size and
maximum load capacity.
Never work under a vehicle supported solely by a trolley jack. Jack
stands should be inserted under a suitable position and the vehicle
lowered onto the jack stands before commencing work. The trolley
jack can be left raised and in position to act as an additional
backup safety measure in the event a jack stand fails.