I'm not sure where you are located but I bought a boat that was located in a pasture in Maine. I chose to use a boat hauler with a hyrdraulic trailer. The price for hauling the boat was identical to what I was quoted for a conventional hauler, and I did not have to pay for either a crane at the Maine end, or a travelift at the Annapolis end of the trip resulting in a big savings. While you may be able to rent a crane capable of handling 20,000 lbs, it won't be cheap.
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Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay and part-time purveyor of marine supplies