Thanks, Brett. I actually found a cheap boat trailer at a couple of the tool outlets for about $450 (including shipping). Should work for my Gheenoe with my 8 HP 4-stroke Mercury, as it's rated for 600 pounds. Haven't had any luck finding used.
I think it's great that you take the time to help so many people out on this site - I've seen quite a few of your fiberglass repair tips, which I'll be using in the near future.