Quite a few years ago (when I was younger) I moved a 3.0mtr x 3.0mtr tin shed from a neighbour’s property across the road to ours. The distance was ~40mtrs.
I used an ordinary removalist type 2 wheeled trolley with ease and tipped it over a 1.8mtr fence into our backyard then moved it ~30mtrs into place.
Balancing the shed on the trolley was the secret in my case. Maybe consider using your car (wife driving) to pull the trolley slowly whilst you balance the shed on it.