I just removed mine, it got to where it would not go back up and i said screw it, need the rear space more then the lift. since mine was already stuck in the down position, I removed the pivot pin bolts and used vise grips to work the pins out, removed the arms and cylinders off the main frame after disconnecting the lines, this took about 2 hours by my self. make sure to disconnect the main power wire first. then tonight I removed the main mounting plate, ( 8 bolts ) I used an electric impact gun from underneath and vise grips holding the top bolts. took about 30 minutes. just beware these things are very very heavy. mine tried to come down on me the first time I opened the door. if it starts to come down, jump out of the way, you will not be able to lift the weight.
hope this helps ya some.