Just a quick point that obviously a trolley Jack and getting the right jacking point either with a beam or without a beam is just to lift the car safely
The ultimate aim is to get some stands underneath that mechanically lock to keep the car up if you are working underneath
Do not work underneath a car just supported by a trolley Jack
A good friend of mine and a car nut nearly killed himself when a car collapsed on him supported by a trolley Jack - he knew the risk but was tempted to do a job that he thought would take seconds
Be safe
