Clean and oiling the reels
Replacing batteries that are 3 years old if you have a outboard.
Inspect and document boat wiring
Inspect trailer wiring
Install a wheel spray system
Repacking wheel bearings
Upgrade / inspect bulge pump wiring
Wash the inside of the hull with fresh water and remove all remaining water
Inspect the inside and outside for corrosion
Inspect anodes inside engine/s and look for internal corrosion
Replace engine anodes that are less than 50%
Replace engine water pump/s if over the recommended hours
Make an appointed with a repair shop before the spring rush.
There must be something I missed, if so let us know what it is.