What is the dimension between the back of the rim and the back bearing?
What is the dimension between the back of the back bearing and front of the front bearing?
Alternatively what is the dimension between the back of the rim and the front of the front bearing?
Just seems like all the shear stress is focused on the two wheel bearing at the end of the axle rather than spread across three points along the axle and the negative offset is only adding to the counter lever effect