Originally Posted by leathermang

Any local hydraulic shop can reseal the hydraulics .....
Check if you can about how well the can be moved around...
How well the rear wheels pivot and how nice the bearing are....
It is critical that all the wheels move freely when you are jacking up
one end of a car where the other end is already on jacks.... that is one of the
main advantages of one of these long base floor jacks....
edit... you do not crawl under any heavy object without regular jacks underneath it.... another post was worded as if it were a choice between a floor jack and the stationary jacks ... the rolling floor jack is nice to get the car up high enough to put the stationary jacks under the car....
a Rolling jack MUST BE ON CONCRETE if jacks are on the other end of the car.. it will move the car if the wheels are not free to move up under the car when jacking...