I hope someone can give me a bit of advice / reassurance. (Won't hold you to it)

I want to cantilever some Ezystrut to my workshop I Beam to pick up a static weight.

Like below, section view.








Using some of these clamps. (Rated at 407kg when used in pairs with a 2:1 safety factor)
www.ezystrut.com.au/products/beam-clamps/e2786/e2786h/

I just don't have the skills to work it out and could not find simple help with Google.

Any of you smart people that work with these calcs all day work it out for me?

Thanks.
Gav.