Precision makes a nice line of trailerables. So does Compac. Seaward makes a 26 footer that is trailerable and they used to make some smaller versions that are still fairly new.
There have been legions of trailer sailors that went out of business in the 80's. Some were nice boats other's were not so nice. All boats of that era would need some pretty extensive refits if they have not been done already. There are probably some pretty good buys on boats out there that have been.
And then there is the Catalina 22 and 25. You will probably find more of those on the used market than any other boat out there. With the possible exception of the Magregor. I personally wouldn't own one, but if going fast is what you need it is probably your go to boat. I don't think I would believe their advertisement about pulling a water ski'er. Maybe a someone on a tube... The ease of trailering is also a nice feature with a water ballast.
always in decline-never hitting bottom