There is a distinction between small sailing trimarans and kayak sailing trimarans. Small sailing trimarans are exclusively designed for sailing; whereas, kayak sailing trimarans are kayaks equipped with sailing rigs, including two floats for added stability. In this latter category I have come across two production boats that are well worth looking at; they are: the Triak and the Viroga.
I have assembled a number of links to websites extolling the virtues of both models. By examining the contents of the sites and related sites, you can come to your own conclusions as to the merits or demerits of the boats.
I like the portability of both trimarans. Each can be transported on a car roof rack and quickly assembled where they are to be launched.
Viroga Tri Video
Triak Sailing Kayak
Videos and Photos of Triak
Labor Day Triaking
2010 Triak Preview