BG's rear rack is simply done. Compared to more bridge like racks with multiple struts, triangulations....

what was on the BG rack riding dirt ?

I cut hoops off for plywood topping extending to under saddle. Hoops stiffen the end rack at front seat stays.

I assume BG's rack is strong enough without hoops or triangulations otherwise I'd hear complaints.

I should try a materials comparison with a complex Tubus rack.