393.106 (d)
(1) this section is saying from deck to object is 1/2 WLL. trailer-binder-object 1/2
(2) this section says from deck, over, around, or though and back to the same side of deck is also 1/2 WLL driver side trailer - chain - object- chain- binder- driver side 1/2
(3) this says driver side over, though or around object to passenger side is Full WLL left side -chain- object- chain- right side Full Wll
Here's a pic I drew of 1, 2 and 3. 1 and 2 are considered direct securement. 3 is indirect securement. 1 and 2 are directly pulling on the object, which are not putting and equal force downward on the object. 3 is indirectly pushing down on the object. It is doing more work then 1 and 2 therefore it gets full WLL.