A related question / poll is:
Do you tie the boltsnap into the tow line, or leave it free to move back and forth on the tow line?
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Talk to Wayne at Amigos, he knows knot all to well. :smt079
I agree with DA; I've never had a problem with one slipping.
In answer to Joe, sometimes, for some unknown reason, I like the tow rope longer than on other days. I can adjust the taut-line hitch while moving, either to shorten or lengthen it. And I let the bolt snap slide freely along the length of the rope.
Edit: Now that I think about it, I can lengthen it while moving but I have to be stopped to shorten it.
Not to go to far off topic from the original knot question...
This is the manner I have found that works good for me. YMMV.
The line is tied to a 1" stainless ring on either side of the DPV via two half hitches. I have a 1" stainless ring on the line that can slide freely. In order to adjust how close the DPV rides to me, I added the knotted line and made "loops" for my double-ender to clip into. This makes for easy adjustments when needed.