"moveable" 4 post lifts are lifts that can be moved around and do not have to be bolted to the floor. back yard buddy and a couple of other manufacturers offer these. basically, this option consists of 4 large caster wheels on "offset" lever attachments. these casters are installed on the bottom of each of the four posts to move the lift around the shop. when they are on the backyard buddy lift, as the lift comes down, it contacts the protruding levers and raises the lift off the ground. i think one of the other manufacturers has the same automatic lift design.
on the backyard buddy, i think the caster option is about $500 but they would be worth the cost if you wanted to move the lift outside in the summer to work on cars - or to move it around the shop if you had a big building.
