Bow shackles by design are made not only to fit wider straps / gear on them but to allow them to take a side load.
A D shackle should only be used straight on and are not designed for a side load.
Rated D shackles on a trailer are fine as as per what ET posted the link to above as long as its rated.
They say this:
"A Bow shackle will provide flexibility for greater angular movement compared to a “D” shackle."
So merely a recommendation that bow shackles should be used where possible.
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