An 83 C-22 is the original version. Most were swing keel's, so I would assume yours is a swing keel and on a trailer? One problem is the two cockpit drains near the companionway. They will clog and/or freeze easy and won't let the cockpit drain. This can cause excessive water to accumulate in the cocpit, and the weight could damage the hull. Catalina Direct has a kit to install the newer version cocpit drains that correctes this problem on the original versions. When I kept the boat next to the house for the winter, I left a light in the cockpit drain area to keep the drains slightly warm to prevent them from freezing. Other than that, I never covered our 1980 C-22 when I lived in the Kansas City area,(had her for 11 years). Several winters I rented a 10 X 35 storage locker, (that was the BEST!). But normally kept her outside for the winter, sometimes with the mast up, usually with the mast down, never did cover her. It was sure nice to put her away in the storage locker and take her out in the spring all nice and clean! She was always clean, and waxed before she was stored for the winter, and that sure helped spring cleaning.
Don