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The coiled cables are self tightening. With chains I would have to use bungee cords to stop them from dragging on the pavement.

There are only two criteria, it seems to me, that must be met:

1. add the proper legal and feel good safety margin

2. are easy and convenient to use.

I stretch them out and hook into place.

Perhaps without the swing tongue the chains are short enough to never reach the ground yet long enough to never snap in a tight turn. I don't think this is true when the attachment point is moved back behind the swing tongue.

I can attach the safety cables with one hand. It requires two hands to plug in the electrical.