HELLO
He is in Iowa. this is winter! Put a piece of plywood down so your jack will not sink into the soil.
Jack up each end one end at a time. Put a 4x4 block under each corner.
Run hose out of house or turn on the outside spicket. Flood ground under she and flood it all the way to where you want to move it. You might need to make a little berm to hold in the water but that might be a problem if the gournd is frozen. You can find something to hold the water in on the down hill side. If there is no slope start in the middle and let the ice form to both sides until you have enough to move the shed. Water will self level. You can use a water level anytime you need to make something flat like forms or a kidney shaped pool. That is what they use in pool building to make sure the rim is flat.
Then when the water freezes lower shed onto the ice.
Put a huge pipe or rod into ground just beyond where you want to move it.
Attach rope, strap, chain or combination of them to the shed. Put a come-along on the stake end and wench it into place on the ice. I have done this once. I did not need a any help or power equipment. The shed will turn in the direction of the pull. Make sure you are centerd or it will not pull streight. You can turn the she by attaching the line to one corner and turn the shed then go back to the center to pull streight.
If there is a slight slope you can cover the ground and make ice without haveing it level as long as it is freezing out whey you run the water.
If you are a big enough person and have cleats you might even be able to push it into place. Just make sure you are not on the down hill side. Death by shed is not a perty sight. LOL
Why do you think it took only one man to build the permids in Egypt? They used one huge ice machine and slid them into place. LOL


If all else fails, look to nature for the answer.