Catalina 22 or Hunter 22 with centerboard. Catalina 25 with centerboard, pretty big boat so not sure on your pulling capacity. Same with the O'Day 25 with centerboard. Both Hunter and Catalina make water-ballasted boats, probably others too. There are numerous other manufacturers out there that make trailerable boats. Do a search on Yachtworld or SailboatListings for boats in the 22-24 or 25 foot range and you will see many opportunities. The Catalina and O'Day 25's, think Hunter has one too not sure, with centerboards can be trailered but most folks call them "transportable" as opposed to truly "trailerable".
Hunter, Catalina, McGreggor are all still in business with active owner associations. There is the West Wight Potters too.... all kinds of things to consider. Probably why I am still "looking in to it" when it comes to buying my boat.
Take your time and you will find the right one for your situation.
EDIT: Also try posting in the various manufacturer specific forums for what peoples experiences are like. Also, there are boat reviews in the "Resources" menu here. Personal experience from owners there as well.