I applaud your feats of strength and perserverence. There IS a simpler method. I rent an air conditioner jack from a local equipment rental place. It is like a big manual fork lift that will completely roll under the trail. It extends 18' high and is the best device to remove/replace air units with. I use one about every other week and would be lost without it. If I keep replacing air units at this pace....I might just have to but one!
