I had the opportunity today to check a section of Oregon law that I had believed to require crossing the chains, but read that the chain(s) must merely prevent the tongue from dragging on the ground.
If your chains originate from one bolt, as they usually do on
Scamp, it is impossible to cross them, just wind them, therefore they have to be short enough that the tongue can't hit the ground, which means they have to be centerlined to accomodate turns.