Moving by flatbed will be vastly easier, IMHO, than disassembling. Those nails are old, you'd have to remove all the cornerboards, etc... My guess is you'd damage quite a bit trying to disassemble/reassemble. I say jack it up, put it on skids, and put it on a trailor. It will cost something, but NOTHING like a new shed that size and quality of constructions. That is going to be an AWESOME and beautiful coop. Congrats!