Below are some "Loads", Provided the bolt is "Rated".
When you order bolts the Company should list the items that are or are not Rated.
If they are not listed as rated, They probably are not rated.
A rated 3/8" eye bolt is good for 144# or 125# pound straight pull.
A "Forged" 3/8" eye bolt may be rated for 1000# or more, Or "Not Rated" at all.
2 X 144# pounds = 288# for a 30# light bar, Even if it is not Rated it will hold.
Of course nothing else is "Rated" on a do DIY project.
Putting together "Rated" parts does not make a finished project "Rated".
Having said to much, I would feel ok working under that rig, However
I am sure most designs could be improved upon, Even the "Rated" ones.
Regards, John