brulaz wrote:
When they crumple permanently, it's right there "where the angle braces connect to the leg". The pivot bolts are fine. I'm thinking of bolting on a piece of 2"x2"x1/8" steel box along the whole outside length of each leg.
There you go, however instead of bolting, weld it to the outside of the leg - whole length is not necessary, maybe just half way to the frame and to the ground would be enough. This is a simply supported beam with a loint load nominally at mid span. Max deflection is in way of the strut.
As for the bolts - I am not surprised that the bolts are fine. It woudl take a lot more load to shear the bolts than to buckle the arm so guess which one will fail first. ;)