Rob, As their shackles are certified there would be no legal reason not to use them - I do have a problem with the Company's "Shackle guide" wherein they stat the only difference between a Dee and Bow shackle is that you can put more ropes on a bow type. A bow shackle is designed as a multi sling lifting shackle whereas a Dee is designed as a single direction pull shackle (the correct type for trailer chains).