Originally Posted by Villen
Looking at the picture I see one chain with a bolt thru one link downgrading the installation to the strength of one chain. The chain on the left could be an owner with brains did not like the original installation and added a separate chain? That chain looks newer but who knows. Might be better quality galvanizing.
Photo illustrates the original factory condition for mounting the "two" chains - bolt thru one link which, as you note, downgrades strength to that of one chain. Chain showing on the far left of the photo is just loose end of the same chain hanging over the front of the coupler. I should have kept that out of the photo to avoid confusion.