Do you own a ship, or can you afford to rent a drydock for a boat?
Most of us have boats hauled. A drydock is a whole other thing. You drive in, close the gates, and pump the water out.
You really got one of those handy?
I was just about to comment on this when I read your post. It is common (but incorrect) to refer to hauling a boat and storing, or working, on it on the hard as "dry docking." As hellosailor points out, a dry dock is a semi-submersible vessel that can be flooded to allow a boat or ship to be moved into it and then pumped out so that the boat or ship can be worked upon in dry conditions.
Storing a sailboat on a trailer or stand and then launching it each time it is used is properly called "dry sailing."