Hello Johannes,
Check out an RC27. There are five of them in Switzerland. The boat is 16ft wide and the tramps cover 21ft of the length. An eight ft diameter pop-up tent fits easily on either the front tramp or the aft tramp. The boat weighs 900 pounds and has a PN of 54. Check out the photos on web site aquarius-sail.com. This boat is what you call a fast cruiser.
Bill