There will always be many suggestions. Some will tell you to support the mast in the middle to keep it from flexing but the issue is how to secure that support base from slipping on the top of the deck. If it slips, then you have some weight to support. In addition, you have to make sure you have exactly the right length. If you are for example tying the roller furling to the mast, yes by all means a middle support is a necessary but if not, generally for a Catalina 22, the support is not really needed as I use to tow man of those from Florida to Virginia as a dealer all the time and of course all over the east coast. I use to own American Marine & Sail Supply.
What helped the most for the Catalina 22 was to simply tie the spreader bars with a line to the life lines to keep the mast from turning and to keep it from bouncing which worked for me. A lot depends on the length of the mast which is why I am specific to the Catalina 22. Even the Hunter 260 and the Catalina 250, I never supported them in the middle unless the roller furling was tied to the mast during transport.
One good piece of advice, never put a cover over the mast for keeping snow, ice and rain out of the boat. If it pools, then the weight of the mast will bend it. If you do, then several supports or more will be needed only for storing, not transporting.