Not a simple question and I am not a mechanical engineer but some things to consider: If the bottom bolt is 'large' enough then the load on the bottom of the bracket causes a rotation (of the bracket) around that bolt. You still have a leverage situation increasing the effective load. You also then have force applied to the bottom of the chassis towards the front and just above, a force towards the back. I suspect that this is not a good thing. Also need to be mindful of the mild steel chassis issue and if there are not a tubes welded tubes across the chassis (where the holes go) to strengthen it, then the load is taken largely on the outside of the chassis box section. The chassis is probably the weakest part of the recovery assembly. As I said earlier, one for an engineer. That said, snatch recovery should be considered the last resort and one you should use only when other recovery methods have failed. Snatching can readily put loads of tens of tonnes on recovery points. Always use a bridle to spread the load across both chassis rails.
Cheers
KarlB
:)

