Depends an awful lot on the shed, and it's value, but mostly on construction.
Does it have a floor? Does it have runner beams under it? Was it built in place or moved there as a unit? Is it structurally sound enough to lift without collapsing.
For rolling a shed to final position rollers of 4" PVC work real well. For pictures if you look for the post AlanB's house rework on the project page you can see how I moved my box shed then we did it on a rollback.
For my little metal sheds about the size that you are describing, 2 of us lifted an edge and slid it over on the trailer on the one with no floor, for the one with the floor I lifted the edge with the Bobcat.
I think mostly the answer is, it depends on the shed, it's location, what you have available to work with and how bad you want it
