Well, our boat (30', 10K disp) is moved every year. The truck/transport is specially designed w/hydraulic arms. They back the boat where it is to go, and set up the stands to take the load when the trailer is moved. No crane needed to pick the boat off the truck and onto the stands/block.
The keel supports all the weight on blocks and the stands balance the boat.
The transport services I have used have been very experienced in doing this and are pretty amazing.
As noted, call around to marinas and ask what they can do...it's fairly standard stuff.