Easiest way is to support it on the side by digging down three feet and
pouring a concrete footer (maybe deeper depending on the frost line).
Then attach heavy ledger boards to the support structure with lag
bolts. Once everything is secure, begin digging under the shed so that
you can drive a car or a truck underneath it. I usually use a Jaguar
since the roof line is low (saves digging). Tie the shed to the roof
and drive out. Reverse the process at the destination.