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You can screw the pads down very low. Some 2 poisters have very thin arms and short threaded pads. If you can't get the arms under the car, then the chassis will definitely catch on the ramps of a 4 poster. We used to have a 4 poster with 2 H beams that ran down the lenght of the ramps, that you could lock into position, place some pads under the chassis, then lower the hoist to leave the car up in the air, but the wheels are free. Also makes a great workbench when doing brakes etc. Also you have to decide whether you want hydraulic or screw thread. 2or 3 phase.
JD
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