Safety Tow Chain Question

Lynnmor wrote:
The idea of the chains forming a cradle, for the most part, is nonsense. Connect the chains leaving enough slack for turns and then uncouple the ball and let the tongue down and you will see that the coupler will hit the ground as the trailer moves forward. The lower the connection point is, the more likely that cradle effect won't happen. The real reason for crossing chains is so they don't pull tight when turning.

What will happen after the bottom of the tongue hits the pavement with the truck still attached with the safety chains?The crossed chains will lift the tongue. If they're not crossed the tongue will still be on the pavement pulled by the chains, or, in the worst case, the coupler will imbed in the roadway, flipping the trailer. The crossed chains also tend to keep the trailer tongue pulled towards the truck's attachment point, should one chain break, not pulling from just one side.
The fact that they are crossed has no bearing on the slack in the chains when turning. That is defined by the length of the chains.