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A definition of terms:
ProffessionalDiary: SWL or WWL (Rigging Terminology)
A test to destruction of a 4.7 tonne rated bow shackle by a commonly available 4x4 magazine a few years ago, showed the shackle actually failed (let go) at about 30 tonnes. So using SWL/WLL, would be an adequate guide. Most, but not all trailer makers only use hardware shop unrated chain. That would probably be your next weak spot.
SWL and WLL are the same........break load is listed on some site, you just have to do a bit of digging. You are on the mark it's around the 5-6 times the SWL
Hayman Reese supply 8mm mild steel shackles even with a HD towbar!
Trailers are manufactured with mild steel safety chains, there is nothing in the Victorian roadworthy regulations about what grade chain is used, just that there is chains.