I had a unit 10ish years ago that the house needed foundation work done all around the house in the heat of the summer. We mounted a board on the side of the house with long lag bolts, put 2x4s 10' long under the unit {it was already on legs} on top of the board and screwed them so they would not move then put the end of the 2xs on block out in the yard. The foundation guys dug under it 30" wide out from the house down to the footings and it stayed on there all summer till the dirt had a chance to settle back in.