Hi, JackOlsen. I commend you for your choice of sailing craft. I am the VP of Communication for the Mariner Class Association, the only group of sailors I think is as great as SBO.
My own 1973 Mariner 2+2 cb is slightly wider than my trailer. Here is a link to
https://sailboatdata.com/sailboat/mariner-19-cb
The Mariner is a beatiful boat with sleek lines. The CB version sits right down on the trailer, with her slim topsides, I don't think mine is over eight feet with the mast laid across the cabin top.
There won't be many boats in her class that take up less room.
I'm not home, so I can't measure my boat for you, but seven feet wide by eight feet tall is a good ballpark measurement.
-Will (Dragonfly)