I'd have to second that kid hauler modification. I've got the same old trailer, and have used it without the additional length a few times. works pretty well, but the boat hangs too far off the back and if you get off the bike goes shooting up into the air!! still worked for getting to Boulder creek from S. Boulder, but I'll be lengthening the tongue this year!!
Livingston-- I've been thinking about a sidecar flatbed myself, if you have any bright ideas, I've got a ton of aluminum and some beginning plans for a flexicar!!!
I've also once just strapped the boat on the side of the bike, with the cockpit over the luggage rack and the bow curve alongside my leg. it actually didn't throw the balance off much at all, but I bet the wind could be a bear... just went around the block that time, but it had some promise...
I also would not bike my boat up 14, but I won't ride a road bike anywhere