Your utility trailer sounds like a good start. I think most cat trailers have the cross bars (hull support) spaced at around 7', front to back. You may have to replace the tounge of the trailer to get it out at least 3' past the front of the bows. (to allow for turning) On a H16, this amounted to around 10' of tounge in front of the front cross bar. For width of the crossbars, most are around 90" or so. I think the centerlines of H16 hulls are around 87" apart. Your 14 might vary?
Good luck,
Jack Hoying
Fort Loramie, Ohio
Prindle 18 #1645
http://www.bright.net/~jmhoying/sailing/prindle.htm