I'm not a designer, but I have been working (with others) on creating a trailarable friendship/weekender design. It takes elements from the friendship sloop, the weekender and a Duck Trap Wherry.
Here is a thread at the Wooden Boat Forum I started on this.
http://www.woodenboat.com/forum/forumdisplay.php?f=2&order=desc&page=4
The design is in the phase where I'm working on final drawings. I'm slow about doing this and work on it in spurts. Eventually I will finsih the design.
Chad