What are the knotting methods for trailer ropes?

Double knot tying
1. First, loop the rope around the object twice.
2. . Then pass the rope end through the second loop and tighten it with force.
3. Finally, just tie a half knot.
Half knot tying
1. First, tie a figure eight knot in the middle of the rope, cross the rope ends first, then the rope ends bypass the main rope, and tighten it after passing through the rope loop.
2. Next, pass the rope end along the knot in the opposite direction through the end of the rope.
3. Then pass the rope head through the first knot (as shown in the figure below) and wind it back under the knot.
4. In the process of winding back, the rope head needs to pass through the lower loop.