firstly its not that easy to put a roller reefing on a sonata to be removed for racing each time.
the age of a sonata works in two ways the hull has a number and once registered the sails have a number
the diffrence between a mark one and two is the mark one outboard engine is transom hung and in a mark two it sits in a well,
please be advised to race in one design there are a number of rules that your find on this website.
As a relativly young (ahem..24) person who has bought a Sonata, I would like to advertise the class by saying that the amount of boat you get for the money is great. We’ve had great fun in ours, and we haven’t even raced OD yet. A lot of people we speak to in the various clubs who have gone on to buy bigger boats say that the Sonata was one of the most fun boats they’ve sailed. Not sure I’ve seen too many keel boats for the price that are either one design or competative in a mixed fleet
I’m not that great a sailor but I reckon your experience in dinghys will serve you well in the Sonata, as they seem very sensitive to weight.
We’ve never trailer sailed ours but I think you must be getting on for the upper limit of doing it, especially with the newer road rules and regs. Saying that though, it can’t be too expensive/difficult as not an insignificant number do take them round the country.