Originally Posted by brasscap
I don't have a winch, but nobody has mentioned anchoring to the frame. Is there a reason that is not an option?
From my experience this pulls down on the boat, not up. So in essence you may make it more difficult to pull the boat up the trailer. Unless your winch is mounted pretty high you will create a v (formed by the strap on top, trailer on bottom, with the point at the winch stand. As you pull the boat farther onto the trailer some of the force starts pulling the boat down onto the trailer, in essence making it heavier (more drag between the raft and trailer). This part is easily fixible by making the stand high enough but then things just get too high and you're cranking from your shoulder height. So I added a d ring under the bow to pull from which worked much better.
Secondly it's always a pain to get the bottom of the boat up onto the trailer (in the absence of a tilt bed) when pulling from the frame. I used to to pull from my anchor system, but it would take two people; one to run the winch and one to lift the stern high enough to get the bottom of the epiece ontop of the roller. The solution to this is to just dunk the trailer (or close to it). Which is what I've done for years anyways. I mostly float the boat halfway on then finish it off by pulling by hand. Winch is for harder ramps.
I really like the principle of wyosams rig if I understand it correctly. Solves both problems mentioned above and I'm curios to explore it.