If the keel breaks it's a problem.

But if the keel is sound, boats can usually be safely supported on blocks
under the keel, with the hull braced along the sides to it stays level.
Take a look around any fishing port or boat yard.

If you are on salt water the boat can be left high and dry at low tide.

If you are on dry land the boat can be jacked up with bottle jacks and
blocks put under the keel. You can get a boat off it's trailer that way.

Boatyards tend to use a frame from which belts are slipped under
the hull to raise it, and pull the trailer out from underneath.

Another method is to hire a crane. Yacht clubs often have or rent a crane
for a day to lift the member's boats out of the water at the end of the
season.

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