Posted by: jbd on Jun-11-12 7:13 PM (EST)
-- Last Updated: Jun-11-12 7:18 PM EST --
might consider the Nalu 12.5 by Ocean Kayaks. Its max weight range is 300 to 350 lbs. I have no idea how much "safety" factor is figured into that. Its possible that anything over 350 lbs would swamp it or it could actuall carry 425 lbs before swamping.
I think most folks would recommend that you try one at a demo days event or even renting for a few hours if you have a kayak or canoe livery reasonably near you.
I just found this http://www.emotionkayaks.com/sit-on-top/
The Mojo model says its max capacity is 375lbs.