The fellow accross from me has a Bayliner 28 1/2 footer with a full Sunbrella mooring cover, stem to stern.
It's a great way to eliminate most of the clean up associated with various pests, dust, etc. Especially useful to someone who lives far away and can only visit the boat once every month or two. (They live in Redwood City, 260 miles away in the Bay Area.)
The bigger the boat, the harder it is to roll it up and store it. It's a lot easier to do on a double fingered slip, and with two people.
If the berth is not covered, rain will accumulate on a loose cover, so a bowed upward support structure will have to be set up over the cockpit to prevent pooling of water.
I'll bet a full cover for a CD-22 would cost at least $1200-$1500 or more, and have to be custom fitted to your rooftop, including radar, searchlight, dinghy, etc.
All antennas have to be put down as well.
Will also serve as a theft deterrent, hiding things from passers by.
Certainly worth a look into!
Joe. :teeth :thup