HANGING PIT JACKS
The hanging pit jacks are suspended in a carriage in which they can traverse. The carriage is on rollers and can move over rails that is mounted in the pit wall.
PORTAL PIT JACKS
A portal pit jack moves over rail in the pit wall, just like hanging models, but instead of one jack it has a frame that can move vertically. This frame has 2 supports that are mounted on extendable cross beams, so lifting a heavy vehicle is much more stable.
MOBILE PIT JACKS
Mobile pit jacks are on wheels and move over the pit floor.