Get a couple threaded chain links. That's what I did.
Recall the chain duty rating doesn't need to match the TT GVWR, rather the tongue weight plus some margin. Those chains don't need to support the entire weight of a trailer, rather catch the tongue should it become uncoupled.
2007 Chevy Duramax LMM/Allison
2012 Jay Flight 29QBH
2012 Jay Flight 26BH (Sold)