The two post lift I looked at had two extendable arms on each post. Each arm rotated from the mount on the post and also had a sliding cradle that would make contact with the frame.
When weight was put on the cradles/arms, they automatically lock into position. This allowed the cradles to be placed just behind the front wheels on the front of the vehicle and just behind in front of the rear wheels at the back of the vehicle.
Slo . . . is the 2-post lift you are using like this?
