That reminded me....Some simple calculations will show the tensile stiffness and strength of the plywood gussets normally used, ...
Several years ago I started a thread, asking if anyone knew how to size gussets. Someone started to look into it, but then the topic seemed to die. And some people scoffed at my question as being a waste of time.
So how DO you know how big and thick to make your gussets?
As I see it, something between toilet paper soaked in T-88 (cheap and readily available) and 3/4 inch plywood (plenty strong) should work.