Hooks will often work with more than one size chain. Maybe you could size your hooks to fit the 2-3 most likely sizes to encounter. There is no penalty for putting on a couple sizes of hooks if you want.
I typically do not have chains for the loader and chains for X and chains for Y. Instead, I have a collection of various sized, length, and rating of chains. I have some 5/16 and 3/8 and 7/16 chains, some in grade 70 (gold) and some not. I tend to use the "good stuff" (DOT grade 70) for securing loads such as a tractor. Any of my chains in a single "ply" will easily safely hold more than my FEL can lift. Why do I buy some quite oversized HD chains? The price was right that day at Harbor Freight and it gives a good upper body workout to use them.
Pat