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Nothing wrong with that. Security is a good thing especially when elevated.

The buckles in the video were older one piece buckles that do slip without a half hitch. The newer ones that are the two separate flat triangles usually do not slip. (Not to be confused with the much...

The adjustable bury should be a bit longer, closer to 8 inches. The 6 inch bury woould hold but may be unreliable. Remember to milk the bury after every adjustment.

A back up hitch is not needed...