Fishingaz,
Welcome to SBO. I really love your little boat. She's a beauty and I'm sure a pleasure to sail. I know you will find what you are looking for on this forum. It is good to have you join us.
It looks like you are in Australia. There are is an Australian who has posted a few videos on YouTube about sailing his trailersailer. Just search trailersailer videos and he will pop-up. I don't know what his boat is, but I think it is in the 20' range. Let us know the answers to some of rgranger's questions.
The setup and design of your potential sailboat has a great deal to do with how satisfied you will be with your decision. My boat is a 19' O'Day Mariner. She has a large cockpit for a boat her size and can accommodate up to six people for a casual day dail. Yet, she still has berths for four. As an overnighter, weekender, that would be ok too. Ideally, two could live on her for a week or more with a carefully planned and thoughtful outfitting. The nice thing about her is how easy she is to rig at the ramp. Many trailersailors design and build mast raising systems to make a difficult task for two, easy for one. The C22 is one of the better rigs for this, I think. There are a lot of trailerables, but they are definitely not all the same. What exactly are you looking to do? Do you want to sail the same way you sail your dinghy only with more camping capacity or are you looking to experience the sailing of a larger boat, maybe take friends and family out? What is your plan for the future? Ocean sailing and living aboard? The C22 is an excellent choice for its size and flexibility, but it sounds like you have bigger plans in the back of your mind.
Also, keep in mind, C22s are enormously popular, which means, later upsizing is easier because a good C22 is not as hard to sell.
-Will (Dragonfly)