How are you tieing down your car in your enclosed trailer

Ddaddy said

I like crossed since there’s less loading per unit length of strap/chain than with uncrossed. A longer strap experiences less strain per inch than a shorter one. Crossed straps are inherently longer and therefore experience less load per length.

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I know you won't like to hear this, but that is incorrect. The force is constant throughout the whole length, regardless of the length. There is no such things as load-spreading along a lengthwise support, loaded at the ends. (1st semester mechanical engineering.)

And if you have both straps or chains straight back, if one breaks, then the other cannot become slack if the restraints at the other end are tight. Del has it 100% right.