Captain Dave,
Both Jaime and Aaronhoy are correct that the greatest strain to pull the tramp out of the side rails occurs near the rear. It is significantly greater since the conversion of the weight at that point to horizontal pull, gives a great mechanical advantage (increase in horizontal force). There seldom is much weight near the front bar.
In my previous post, I mentioned the loop of line I put around the side bar to retain the tramp in the slot. It works. If for some reason you wanted to reverse the flare and put it aft, you could use my suggestion to retain the tramp.
Howard